Ejaculation
Genitalia, Male
Sperm Transport
Mating Preference, Animal
Fertility
Competitive Behavior
Pregnanediol
Sex Attractants
Genitalia, Female
Spiders
Arthropods of the class ARACHNIDA, order Araneae. Except for mites and ticks, spiders constitute the largest order of arachnids, with approximately 37,000 species having been described. The majority of spiders are harmless, although some species can be regarded as moderately harmful since their bites can lead to quite severe local symptoms. (From Barnes, Invertebrate Zoology, 5th ed, p508; Smith, Insects and Other Arthropods of Medical Importance, 1973, pp424-430)
Panstrongylus
Tephritidae
Consummatory Behavior
Papio hamadryas
Penis
The external reproductive organ of males. It is composed of a mass of erectile tissue enclosed in three cylindrical fibrous compartments. Two of the three compartments, the corpus cavernosa, are placed side-by-side along the upper part of the organ. The third compartment below, the corpus spongiosum, houses the urethra.
Oviposition
Spermatozoa
Mature male germ cells derived from SPERMATIDS. As spermatids move toward the lumen of the SEMINIFEROUS TUBULES, they undergo extensive structural changes including the loss of cytoplasm, condensation of CHROMATIN into the SPERM HEAD, formation of the ACROSOME cap, the SPERM MIDPIECE and the SPERM TAIL that provides motility.
Weevils
Bedbugs
Bugs of the family CIMICIDAE, genus Cimex. They are flattened, oval, reddish insects which inhabit houses, wallpaper, furniture, and beds. C. lectularius, of temperate regions, is the common bedbug that attacks humans and is frequently a serious pest in houses, hotels, barracks, and other living quarters. Experiments have shown that bedbugs can transmit a variety of diseases, but they are not normal vectors under natural conditions. (From Dorland, 27th ed; Borror, et al., An Introduction to the Study of Insects, 4th ed, p272)
Gryllidae
Chiroptera
Poecilia
Triatominae
Pair Bond
Drosophila melanogaster
Clitoris
Cloaca
A dilated cavity extended caudally from the hindgut. In adult birds, reptiles, amphibians, and many fishes but few mammals, cloaca is a common chamber into which the digestive, urinary and reproductive tracts discharge their contents. In most mammals, cloaca gives rise to LARGE INTESTINE; URINARY BLADDER; and GENITALIA.
Cyprinodontiformes
An order of fish with eight families and numerous species of both egg-laying and livebearing fish. Families include Cyprinodontidae (egg-laying KILLIFISHES;), FUNDULIDAEl; (topminnows), Goodeidae (Mexican livebearers), Jenynsiidae (jenynsiids), Poeciliidae (livebearers), Profundulidae (Middle American killifishes), Aplocheilidae, and Rivulidae (rivulines). In the family Poeciliidae, the guppy and molly belong to the genus POECILIA.
Beetles
Social Dominance
Grooming
Sex Characteristics
Passeriformes
Conflict (Psychology)
The internal individual struggle resulting from incompatible or opposing needs, drives, or external and internal demands. In group interactions, competitive or opposing action of incompatibles: antagonistic state or action (as of divergent ideas, interests, or persons). (from Merriam-Webster's Collegiate Dictionary, 10th ed)
Estrus
Disorders of Sex Development
In gonochoristic organisms, congenital conditions in which development of chromosomal, gonadal, or anatomical sex is atypical. Effects from exposure to abnormal levels of GONADAL HORMONES in the maternal environment, or disruption of the function of those hormones by ENDOCRINE DISRUPTORS are included.
Semen
Animal Structures
Biological Evolution
Songbirds
Diptera
An order of the class Insecta. Wings, when present, number two and distinguish Diptera from other so-called flies, while the halteres, or reduced hindwings, separate Diptera from other insects with one pair of wings. The order includes the families Calliphoridae, Oestridae, Phoridae, SARCOPHAGIDAE, Scatophagidae, Sciaridae, SIMULIIDAE, Tabanidae, Therevidae, Trypetidae, CERATOPOGONIDAE; CHIRONOMIDAE; CULICIDAE; DROSOPHILIDAE; GLOSSINIDAE; MUSCIDAE; TEPHRITIDAE; and PSYCHODIDAE. The larval form of Diptera species are called maggots (see LARVA).
Observation
The act of regarding attentively and studying facts and occurrences, gathering data through analyzing, measuring, and drawing conclusions, with the purpose of applying the observed information to theoretical assumptions. Observation as a scientific method in the acquisition of knowledge began in classical antiquity; in modern science and medicine its greatest application is facilitated by modern technology. Observation is one of the components of the research process.
Ganglia, Invertebrate
Clusters of neuronal cell bodies in invertebrates. Invertebrate ganglia may also contain neuronal processes and non-neuronal supporting cells. Many invertebrate ganglia are favorable subjects for research because they have small numbers of functional neuronal types which can be identified from one animal to another.
Testosterone
A potent androgenic steroid and major product secreted by the LEYDIG CELLS of the TESTIS. Its production is stimulated by LUTEINIZING HORMONE from the PITUITARY GLAND. In turn, testosterone exerts feedback control of the pituitary LH and FSH secretion. Depending on the tissues, testosterone can be further converted to DIHYDROTESTOSTERONE or ESTRADIOL.
Insects
The class Insecta, in the phylum ARTHROPODA, whose members are characterized by division into three parts: head, thorax, and abdomen. They are the dominant group of animals on earth; several hundred thousand different kinds having been described. Three orders, HEMIPTERA; DIPTERA; and SIPHONAPTERA; are of medical interest in that they cause disease in humans and animals. (From Borror et al., An Introduction to the Study of Insects, 4th ed, p1)
Drosophila
Rats, Long-Evans
An outbred strain of rats developed in 1915 by crossing several Wistar Institute white females with a wild gray male. Inbred strains have been derived from this original outbred strain, including Long-Evans cinnamon rats (RATS, INBRED LEC) and Otsuka-Long-Evans-Tokushima Fatty rats (RATS, INBRED OLETF), which are models for Wilson's disease and non-insulin dependent diabetes mellitus, respectively.
Luteinizing Hormone
A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity.
Aggression
Macaca
Gonadal Steroid Hormones
Animals, Genetically Modified
Drosophila Proteins
Ovary
The reproductive organ (GONADS) in female animals. In vertebrates, the ovary contains two functional parts: the OVARIAN FOLLICLE for the production of female germ cells (OOGENESIS); and the endocrine cells (GRANULOSA CELLS; THECA CELLS; and LUTEAL CELLS) for the production of ESTROGENS and PROGESTERONE.
Microdialysis
Pregnancy
Selection, Genetic
Microinjections
Seasons
Analysis of Variance
Pregnancy, Animal
Testis
Species Specificity
The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.
Uterus
The hollow thick-walled muscular organ in the female PELVIS. It consists of the fundus (the body) which is the site of EMBRYO IMPLANTATION and FETAL DEVELOPMENT. Beyond the isthmus at the perineal end of fundus, is CERVIX UTERI (the neck) opening into VAGINA. Beyond the isthmi at the upper abdominal end of fundus, are the FALLOPIAN TUBES.
Dopamine
One of the catecholamine NEUROTRANSMITTERS in the brain. It is derived from TYROSINE and is the precursor to NOREPINEPHRINE and EPINEPHRINE. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. A family of receptors (RECEPTORS, DOPAMINE) mediate its action.
Extracellular Space
Pituitary Gland
Radioimmunoassay
Classic quantitative assay for detection of antigen-antibody reactions using a radioactively labeled substance (radioligand) either directly or indirectly to measure the binding of the unlabeled substance to a specific antibody or other receptor system. Non-immunogenic substances (e.g., haptens) can be measured if coupled to larger carrier proteins (e.g., bovine gamma-globulin or human serum albumin) capable of inducing antibody formation.
Gonadotropin-Releasing Hormone
A decapeptide that stimulates the synthesis and secretion of both pituitary gonadotropins, LUTEINIZING HORMONE and FOLLICLE STIMULATING HORMONE. GnRH is produced by neurons in the septum PREOPTIC AREA of the HYPOTHALAMUS and released into the pituitary portal blood, leading to stimulation of GONADOTROPHS in the ANTERIOR PITUITARY GLAND.
Progesterone
The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS.
Linear Models
Estradiol
Phenotype
Models, Biological
Prolonged mating in prairie voles (Microtus ochrogaster) increases likelihood of ovulation and embryo number. (1/462)
Prairie voles are induced ovulators that mate frequently in brief bouts over a period of approximately 24 h. We examined 1) impact of mating duration on ovulation and embryo number, 2) incidence of fertilization, 3) temporal pattern of embryo development, 4) embryo progression through the reproductive tract over time, and 5) embryo development in culture. Mating was videotaped to determine first copulation, and the ovaries were examined and the reproductive tracts flushed at 6, 8, 10, 12, 16, 20, and 24 h and 2, 3, and 4 days after first copulation. The number of mature follicles and fresh corpora lutea and the number and developmental stage of embryos were quantified. One, two-, and four-cell embryos were cultured in Whitten's medium. Mature follicles were present at the earliest time examined (6 h). Thirty-eight percent of females that had been paired for < 12 h after the first copulation ovulated, whereas all females paired >/= 12 h after the first copulation ovulated. Virtually all (> 99%) oocytes recovered from females paired for >/= 12 h after first copulation were fertilized. Pairing time after first copulation and mean copulation-bout duration were significant (p < 0.05) determinants of embryo number. Embryos entered the uterine horns and implanted on Days 3 and 4, respectively, after first copulation (Day 0). Embryos cultured in vitro underwent approximately one cell division per day, a rate similar to that in vivo. We conclude that prairie voles ovulate reliably after pairing for >/= 12 h, although some females showed exceptional sensitivity not predicted by the variables quantified. Prolonged mating for longer than 12 h increased the total embryos produced. This mechanism likely has adaptive significance for increasing offspring number. (+info)Effect of pelvic endometrial implants on overall reproductive functions of female rats. (2/462)
The effects of pelvic endometrial implants on the overall reproductive potential of female rats were investigated. After homologous transplantation in the peritoneum, the ectopic endometrium developed into highly vascularized nodes that gradually increased in mass until the 9th week postsurgery and then plateaued. In the presence of these implants, overall reproductive function was adversely affected. The effect was of greatest magnitude during 50-70 days posttransplantation. As compared with values in corresponding controls, ovulation was reduced by 43% (6 of 14) (p < 0.05), mating rate was reduced by 44% (12 of 27) (p < 0.025), and premature termination of pregnancy occurred in 34% (5 of 15) of rats. Wastage of pregnancy, which included complete termination or reduction of fetal number, occurred during the postimplantation course of gestation. Furthermore, 100% of the rats with transplants failed to respond to the copulomimetic stimulation for the induction of pseudopregnancy (p < 0.01, compared with corresponding controls). However, on exposure to vasectomized males, 46% (6 of 13) of these rats exhibited development of pseudopregnancy (p < 0.05, compared with corresponding group receiving copulomimetic stimulation). Increased rate of mating failure and differential pseudopregnancy rates after copulomimetic and natural cervical stimulation suggest that the rats with endometrial explants possibly had an absence or a short appearance of behavioral estrus. Hormonal assessment during the preovulatory phase showed a tendency toward lower mean levels of preovulatory estradiol and significantly lower LH (p < 0.01) and progesterone (p < 0.01) concentrations. The adversely affected reproductive functions may be a secondary consequence of these altered endocrine milieus. (+info)Control of oocyte maturation in sexually mature Drosophila females. (3/462)
In many sexually mature insects egg production and oviposition are tightly coupled to copulation. Sex-Peptide is a 36-amino-acid peptide synthesized in the accessory glands of Drosophila melanogaster males and transferred to the female during copulation. Sex-Peptide stimulates vitellogenic oocyte progression through a putative control point at about stage 9 of oogenesis. Here we show that application of the juvenile hormone analogue methoprene mimics the Sex-Peptide-mediated stimulation of vitellogenic oocyte progression in sexually mature virgin females. Apoptosis is induced by 20-hydroxyecdysone in nurse cells of stage 9 egg chambers at physiological concentrations (10(-7) M). 20-Hydroxyecdysone thus acts as an antagonist of early vitellogenic oocyte development. Simultaneous application of juvenile hormone analogue, however, protects early vitellogenic oocytes from 20-hydroxyecdysone-induced resorption. These results suggest that the balance of these hormones in the hemolymph regulates whether oocytes will progress through the control point at stage 9 or undergo apoptosis. These data are further supported by a molecular analysis of the regulation of yolk protein synthesis and uptake into the ovary by the two hormones. We conclude that juvenile hormone is a downstream component in the Sex-Peptide response cascade and acts by stimulating vitellogenic oocyte progression and inhibiting apoptosis. Since juvenile hormone analogue does not elicit increased oviposition and reduced receptivity, Sex-Peptide must have an additional, separate effect on these two postmating responses. (+info)17beta-estradiol rapidly facilitates chemoinvestigation and mounting in castrated male rats. (4/462)
Testosterone and estradiol act synergistically to stimulate male sexual behavior. Previous studies demonstrated that testosterone's actions are mediated genomically. Attempts to show that estradiol acts in a similar fashion have been inconclusive. However, estrogens have been shown to exert short-latency effects by acting directly on neuronal membranes. The present experiment examined whether testosterone or estradiol rapidly facilitates copulatory behaviors in castrated sexually experienced rats. Within 35 min of administration, estradiol stimulated chemoinvestigation and frequency of mounting and reduced mount latency in a dose-dependent manner. In contrast, acute administration of testosterone did not alter sexual activity. These data demonstrate for the first time that estradiol exerts short-latency effects on copulatory behavior, providing indirect evidence that this action is mediated through a nontranscriptional mechanism. (+info)Sperm transport and storage in the agile antechinus (Antechinus agilis). (5/462)
This study was an examination of the timing of ejaculation and the dynamics of sperm transport in the female reproductive tract of the agile Antechinus (Antechinus agilis) and the relationship of these parameters to single and multiple matings. Mating in this species is characteristically long compared with that of other mammals, lasting for up to 8-12 h during which time the pair remain locked together. After the first hour of mating, only approximately 40% of males had ejaculated, but by the third hour all males had ejaculated. The total number of spermatozoa extracted from the female tract remained at approximately 30 x 10(3) spermatozoa per side over the next 9 h of copulation. After completion of male/female access (12 h), approximately 56% of spermatozoa extracted were located in the lower isthmic region of the oviduct where specialized sperm storage crypts are located. The number of spermatozoa extracted from the female reproductive tract did not decline over the next 3 days, but there was a change in the distribution of spermatozoa with an increase in the proportion of extracted spermatozoa stored in the lower isthmus (approximately 76%). However, 7 to 14 days after mating, only approximately 30% of the stored spermatozoa ( approximately 9.4 x 10(3) spermatozoa per side) were still present in the isthmus. When females were mated with a second male on a consecutive day, the sperm numbers extracted from the tract were about twice that deposited during single mating, with sperm transport to the lower isthmus occurring over a similar time frame. Although the occurrence of extended copulations in the wild has not yet been confirmed, these laboratory results suggest that similar periods of copulation are likely, since completion of the ejaculation process requires at least 3 h. The extended copulation in A. agilis reduces the possibility of an early second mating, which might interfere with the normal transport and crypt colonization of spermatozoa through competition. (+info)Induction of pseudopregnancy in the mongolian gerbil (Meriones unguiculatus) by vaginal stimulation. (6/462)
In rats, pseudopregnancy has been induced by mating with vasectomized males, by mechanical stimulation of the uterine cervix with a glass rod or vibrator, and by stimulation of the vagina with a tampon. On the other hand, no practical data are available in reports on the induction of pseudopregnancy in Mongolian gerbils. Pseudopregnancy of gerbils has been induced by mating with vasectomized males. But this method was uncertain because the incidence of pseudopregnancy was lower than that obtained in rats by other means. In the present study, two experiments were undertaken as follows. 1) Copulatory behavior of gerbils was observed for one hour to determine the most effective stimulation interval. 2) From the results of Experiment 1, female gerbils in estrus were mechanically stimulated to test the effectiveness of inducing pseudopregnancy by vaginal stimulation at various time intervals. The results of these experiments indicated that, although the frequency of copulatory behavior varied among individuals, on average the most effective method for inducing pseudopregnancy was stimulation of 5 min duration and at 20 or 30 min intervals. Because the incidence of pseudopregnancy induced by such mechanical stimulation (83.3%) was higher than that induced by mating with vasectomized males (30.0%), this method might be useful in inducing pseudopregnancy in Mongolian gerbils. (+info)TGFbeta-like signaling and spicule development in Caenorhabditis elegans. (7/462)
A TGFbeta-like signal is required for spicule development in Caenorhabditis elegans males. This signal appears to originate in the male-specific musculature and is required for the migrations of cells within the proctodeum. The migrations of these cells form cellular molds, the spicule traces, in which the cuticle of the spicules is secreted. Mutations in daf-4, sma-2, sma-3, and sma-4, which disrupt TGFbeta-like signaling, result in aberrant migrations and morphologically abnormal spicules. daf-4, and hence the TGFbeta-like signal, is required prior to or during cell migrations. Therefore, the TGFbeta-like signal may act to prime the migrating cells or as a guidance cue. Mutations in lin-31 result in identical cell migration and spicule morphology defects. Thus, lin-31, which encodes a "winged helix" protein (Miller et al., Genes Dev. 7, 933-947, 1993), may be a component of this TGFbeta-like signaling pathway. (+info)Behavior and endocrine changes in high-performing, low-performing, and male-oriented domestic rams following exposure to rams and ewes in estrus when copulation is precluded. (8/462)
High-performing, low-performing, and male-oriented rams were used to investigate behavior and neuroendocrine correlates of sexual interest and discrimination. Treatment consisted of visual and olfactory contact with stimulus animals through a woven wire fence, which inhibited copulation (either ewes in estrus or other rams), for 4 h on each of three consecutive days. Before exposure to stimulus animals on d 1 and during the final 1 h of exposure on d 2, blood samples were collected every 15 min for 1 h to determine concentrations of LH and testosterone. During exposure to stimulus animals, rams were continuously observed and investigatory behaviors were recorded. There was no day effect for any behavior. Groups of rams differed (P < .05) in amounts of behaviors exhibited, but behaviors were not influenced by sex of stimulus animals. High-performing rams exhibited more (P < .05) investigatory behaviors toward stimulus animals than low-performing or male-oriented rams. Plasma concentrations of LH increased (P < .05) in high-performing rams following exposure to estrous ewes, but not following exposure to rams. In low-performing and male-orientated rams, concentrations of LH were unchanged regardless of sex of the stimulus animal. Change in plasma concentrations of testosterone from pre- to posttreatment did not differ between high-performing, low-performing, and male-oriented rams. However, low-performing rams exhibited an increase (P < .05) in plasma concentrations of testosterone following exposure to rams. In conclusion, high-performing rams exhibit a high degree of investigatory behaviors toward estrous ewes and other rams. High-performing rams seem to discriminate sex of stimulus animals and exhibit a neuroendocrine response (i.e., increased plasma LH) only when exposed to ewes in estrus. The sensory signals provided by estrous females are either not detected by low-performing or male-oriented rams or are not sufficiently provocative to elicit further investigation by these rams. (+info)
Caenorhabditis elegans Male Copulation Circuitry Incorporates Sex-Shared Defecation Components To Promote Intromission and...
A 3D-Video-Based Computerized Analysis of Social and Sexual Interactions in Rats
c-fos down-regulation inhibits testosterone-dependent male sexual behavior and the associated learning - Niessen - 2013 -...
Two-sex population dynamics in space: effects of gestation time on persistence. - Semantic Scholar
The Ovulator: fertility and period tracker on the App Store
NIOSHTIC-2 Publications Search - 00139173 - An evaluation of the copulatory, endocrinologic, and spermatotoxic effects of...
WoRMS - World Register of Marine Species - Photogallery
Top Pharmacy: Viagra super active vs viagra work since 1996!
rNSET™ (Non-Surgical Embryo & Sperm Transfer) Device for Rats 70010 (1 - ParaTechs Corporation
images of different layers of the road
Please help me Im so scared - Forum on Mental Health and HIV -- TheBody.com
Viagra Mexico
Does male sexual behavior require progesterone?
ORBi: Browsing ORBi
Pre- and Post-Translational Regulation of Aromatase by Steroidal and Non-Steroidal Aromatase Inhibitors - Foidart Agnès
Female copulatory vocalizations - Wikipedia
Expression of 5α- and 5β-reductase in spinal cord and muscle of birds with different courtship repertoires | Frontiers in...
Mesolimbic pathway - Wikipedia
ORBi: Browsing ORBi
C. elegans male tail development - CaltechTHESIS
Top Rated] Extra Male Chromosome In Male Behavior Low Price - Opec.go.th
Microbrotula greenfieldi
Journal Of Arachnology Volume 33 Issue #1 Contents
ADW: Vultur gryphus: INFORMATION
Alarm substance | fish secretion | Britannica
wholesale bitumen mixture mixing implementor for mixing asphalt road
Fossa (animal) - Wikipedia, the free encyclopedia
Parahepomadus vaubani
Bathymunida rudis
Periclimenes gonioporae
New evidence that BPA changes male behavior
HARDCORE ZEN: Crazy Wisdom? Or Just Plain Nuts?
HARDCORE ZEN: Crazy Wisdom? Or Just Plain Nuts?
Texas Drugstore: Levitra glens falls brands drugs!
Descriptive essays: February 2018
Experimental evolution under hyper-promiscuity in Drosophila melanogaster
Why some animals still have a penis bone
Tobacco Road - Viquipèdia, lenciclopèdia lliure
RIDING THE WIND: Leadville 100 2009--DNF
RIDING THE WIND: Leadville 100 2009--DNF
Maintenance & Wear Parts
Risk Assessment 101
Non-Reflected Light
Female Chi Exhibiting Male Behavior
Pholcidae
WASM逆向分析 - Hk Mayfly - 博客园
100% Echte Anabolika Kaufen | Besten Steroide Bestellen
Mounting and Accessories
The main olfactory system - Kidney Disease - Ormed Medical Exchange
Validation of a modified PCR-based method for identifying mutant restricted ovulator chickens: Substantiation of genotypic...
Frontiers | Sexual activity increases the number of newborn cells in the accessory olfactory bulb of male rats | Frontiers in...
japanese female ejaculation
ORBi: Browsing ORBi
drug rehab in mccully moiliili honolulu hi
| drug rehab in harvard place eastlawn san antonio tx
watery ejaculation - Symptoms, Treatments and Resources for watery ejaculation
Importance of a Positive Self-Image | SexInfo Online
Ejaculation Female Sex Tube Films, Free Ejaculation Female Fuck Tube, Free XXX Videos, Free Ejaculation Female Sex Movies....
Female Ejaculation Spy Videos & Hidden Camera Female Ejaculation Xxx Tubes
Biking Ethiopia Blog
Top 50 Home Tutors in Hyderabad - Private Tutors in Hyderabad
Female Ejaculation | Jane Says
Female Ejaculation and the G-Spot | The Smitten Kitten
Ejaculation
Ejaculation Trainer by Matt Gorden Review
Check mass ejaculation mature tramps on our milf bukkake site
First ejaculation - What You Need to Know
Little Known Facts About Leyzene2.
4:26 am
Consult on Female Ejaculation | Tracy Lee | Sacred Eros Website Article
Female Ephemerella invaria (Sulphur Dun) Mayfly Dun Pictures
Female Procloeon (Tiny Sulphur Duns) Mayfly Dun Pictures
Sex without ejaculation |
Mumsnet Discussion
Female ejaculation? | LPSG
Exploring the G-Spot and Female Ejaculation Tickets, Mon, May 11, 2015 at 6:30 PM | Eventbrite
Ejaculation Trainer By Matt Gorden Review
Ejaculation Sex Porn Videos
Male Ejaculation Summit Decisive Battle | Gay BDSM Free Porn Download | GayTrans.com
How to Delay and Control Ejaculation | Sex-Toys.How
Mens orgasim with out ejaculation - Created by extrafun on Mar 15, 2011: EdenFantasys Forum
KAWD-829 Rika Mari, Yuna Himekawa Ejaculation
Triple ejaculation in one wank - Amazing man cums 3 times
Squirting Ebony Babe with Nice Pussy Piercing! Blackandebony Female Ejaculation. 8 Min - PussySpace.com
Female Ejaculation
Deep throat ejaculation blooper | cesnews.ru
Ejaculation Trainer Review
How to Increase Volume of Ejaculation and Cum More
Strange Ejaculation at SoloTouch.com
Human reproduction
Copulation[edit]. Main article: Sexual intercourse. Human reproduction naturally takes place as internal fertilization by ... Human reproduction normally begins with copulation, followed by nine months of pregnancy before childbirth, though it may be ...
Wikipedia talk:WikiProject Fishes/Archive 3
RFC at Talk:Copulation#Should_the_Copulation_article_exist.3F. You may want to participate in the RFC at Talk:Copulation#Should ... the_Copulation_article_exist.3F --Philcha (talk) 12:05, 9 April 2011 (UTC) ...
Sexual intercourse
... such as by cloacal copulation. For most non-human mammals, mating and copulation occur at the point of estrus (the most fertile ... Before mating and copulation, the male spider spins a small web and ejaculates on to it. He then stores the sperm in reservoirs ... Coitus and copulation are both technical terms for sexual intercourse. The male sex act involves an erection, in which the limp ... Copulation, by contrast, more often denotes the mating process, especially for non-human animals; it can mean a variety of ...
Venezuelan Spanish
Copulation. Lit. Dust. Ponsigué = n. Ber. Prendido(a) = adj. Tipsy, wanting more. Lit. Ignited, turned on. Puta = n. Used in ...
Capital punishment in California
... oral copulation; burglary; arson; train wrecking; mayhem; rape by instrument; carjacking; torture; poisoning (17) the murder ...
Pelvic thrust
In whitetail deer, copulation consists of a single pelvic thrust. One of the first to perform this move on stage was Elvis ... The pelvic thrust is used during copulation by many species of mammals, including humans, or for other sexual activities (such ... copulation thrusting. Bruce Bagemihl (15 January 1999). Biological Exuberance: Animal Homosexuality and Natural Diversity. ...
Canine reproduction
... and the females mentally and physically become receptive to copulation. It is only during estrus that copulation will result in ... CopulationEdit. "Copulatory tie" redirects here. For copulatory tying in non-canine animals, see Fossa (animal) § Breeding, ... As with most tetrapods, canine copulation involves the male mounting the female from behind, a position that is referred to as ... Virgin dogs can become quite distressed at finding themselves unable to separate during their first copulation, and may try to ...
Mora witch trial
Music and copulation. Building a stone house to preserve the witches at the Day of Judgement, but the walls were perpetually ...
Letter-winged kite
Copulation often follows. There does not appear to be a set breeding season; instead, the species forms nesting colonies in ...
Red-footed falcon
Copulation then occurred. After copulation, the female returned to sit in the nest until the male fed her again. This behaviour ... The frequent copulations and lengthy stay of the female in the nest suggested incubation but the researchers did not check the ... Frequent copulation was interspersed with joint inspections of the magpie nest. The morning after the aforementioned ...
Mohja Kahf
"Copulation in English." Paris Review #164 Winter 2002-2003, p. 76. Novel, The Girl in the Tangerine Scarf 2006, Carroll & Graf ...
Monobia quadridens
Copulation lasts for 30 minutes in M. quadridens, while in most wasp species, it only lasts a minute or two. It nests in a ... ISBN 978-0-19-530785-6. Kenneth G. Ross & Robert W. Matthews (1991). "Courtship and copulation". The Social biology of wasps. ...
Life in Squares
Copulation a tremendous success!' Attagirl". In The Independent, Ellen E Jones was less impressed, writing: "The romantic ...
Gunnison's prairie dog
Copulation usually occurs underground. Females produce one litter per year of four to five pups. Once the pups are born, the ... Hoogland, John L. "Estrus and copulation of Gunnison's prairie dogs." Journal of Mammalogy 79.3 (1998): 887-897. "Gunnison's ...
Dromedary
Copulation begins with foreplay; the male smells the female's genitalia and often bites her there or around her hump. The male ... Copulation takes from 7 to 35 minutes, averaging 11 to 15 minutes. Normally, three to four ejaculations occur. The semen of a ...
Tandonia nigra
Copulation occurs in July. Adults, semiadults and juveniles were observed simultaneously from May to October. The life cycle ...
Monogamy
It is becoming clear that even animals that are overtly socially monogamous engage in extra-pair copulations. For example, ... This is called extra-pair copulation. Sometimes these extra-pair sexual activities lead to offspring. Genetic tests frequently ... Welsh, D., Sedinger, J.S. (1990). "Extra-Pair copulations in Black Brant". The Condor. 92 (1): 242-4. doi:10.2307/1368407. ... doi:10.1163/156853983X00390.CS1 maint: multiple names: authors list (link) Reichard, U. (1995). "Extra-pair Copulations in a ...
Tree swallow
Copulation occurs multiple times. Eggs are laid from early May to mid-June (although this is happening earlier due to climate ... During copulation, the male hovers over the female, and then mounts her, giving ticking calls. He then makes cloacal contact ... The male often utters a ticking (or rasping) aggression call during copulation, and both sexes use it at the end of mobbing ... Females may also choose sperm after copulation to ensure a compatible mate. In support of this theory, a 2007 study found that ...
Dicladispa armigera
Copulation requires ~1 hour. Postcopulatory behaviors are brief. D. armigera are known to cause significant plant damage, ...
D. Frank McKinney
"Forced copulation in captive mallards (Anas platyrhynchos): II. Temporal factors" from 1982 and "Forced Copulation in Captive ... with Kimberly Ming Tak Cheng & Jeffrey Thomas Burns (1983). "Forced Copulation in Captive Mallards III. Sperm Competition" (PDF ... with Kimberly Ming Tak Cheng & Jeffrey Thomas Burns (1982). "Forced copulation in captive mallards (Anas platyrhynchos): II. ... with Pierre Mineau & Scott Richard Derrickson (1983). "Forced Copulation in Waterfowl". Behaviour. 86 (3/4): 250-294. doi: ...
Elaphe
After copulation, Elaphe spp. seek an appropriate place to lay the developing eggs. They usually lay eggs in the soft heart of ... They continue in such position, which is then followed by dancing for up to an hour before copulation, during which the male ...
Indianmeal moth
Thus, copulation rarely occurs. Even when courtship does continue to a later stage, the female of the other species rejects the ... For males, it is vital to ensure paternity after copulation. To ensure this trait, males who mate with a female first (before ... and nutrients into the bursa copulatrix of the female during copulation. Other donations after the first mating are smaller in ... which facilitates copulation. Indian-meal moths are known to mate multiple times. ...
Broadnosed pipefish
Courtship and copulation follow a stereotyped pattern, beginning when one fish identifies a prospective mate nearby and ... Males, on the other hand, can selectively absorb the eggs of lower-quality females after copulation. By doing so, the male ... "Pipefish Courtship and Copulation". W. W. Norton & Company. Berglund, Anders; Rosenqvist, Gunilla; Svensson, Ingrid (1988). " ...
Sexual conflict
The duration of copulation can be extremely long. For water strider Aquarius najas it was a total of 3 months. For water ... Forced copulation (sexual coercion) by males occurs in a wide range of species and may elicit behaviors such as aggression, ... Males cannot force copulation; however, while females lay eggs fertilized from a previous mating, a new male mounts the female ... During forced copulation, male water striders (genus Gerris) attack females. As a result, a struggle occurs because the female ...
Pier Paolo Pasolini
Pasolini, Pier Paolo (1 January 1975). "L'aborto il coito" [Abortion, Copulation]. Corriere della Sera. Archived from the ...
Black-tailed jackrabbit
Ovulation is induced by copulation. The breeding season is variable depending upon latitude and environmental factors. In the ...
Dibatag
Once in close contact with the female, he slowly raises his foreleg between her hindlegs; this is followed by copulation. After ...
Amegilla dawsoni
After this, copulation is complete. Female bees will rarely mate more than once - this causes fierce competition between males ... Therefore, recently mated females are still attractive to patrolling bees, and must actively resist copulation. The shift ... after which he will begin copulation, which occurs in 3 phases. In the first phase, the male will mount the female and will ... or interior region of copulation, and a curved maxillary palpus with distinctive surrounding fringe. These traits when ...
Heuglin's gazelle
Copulation lasts a few seconds; the male stands upright on the hindfeet and mounts the female. Gestation lasts 184 to 189 days ...
Wildcat
Ovulation is induced through copulation. Spermatogenesis occurs throughout the year. During the mating season, males fight ...
Coordinating Copulation | HHMI.org
Russian copulation - Wikipedia
Copulation (zoology) - Wikipedia
... are specific to copulation. These innate processes direct heterosexual copulation. Female lordosis behaviour became secondary ... Before mating and copulation, the male spider spins a small web and ejaculates on to it. He then stores the sperm in reservoirs ... In zoology, copulation is animal sexual behavior in which a male introduces sperm into the females body, especially directly ... The duration of copulation varies significantly between mammal species, and may be correlated with body mass, lasting longer in ...
RhymeZone: copulations definitions
Biology: Complex Copulation | Princeton Alumni Weekly
Download Animal Birds Copulations European, birds, outdoor, weights...
Ovulation, Meet Copulation! The Beauty of Efficiency in Wild Sex... - Scientific American Blog Network
Insects | Free Full-Text | Putative Drone Copulation Factors Regulating Honey Bee (Apis mellifera) Queen Reproduction and...
Herein, we summarize the mating biology of honey bees, the changes queens undergo during and after copulation, and the role of ... Putative Drone Copulation Factors Regulating Honey Bee (Apis mellifera) Queen Reproduction and Health: A Review by Laura M. ... "Putative Drone Copulation Factors Regulating Honey Bee (Apis mellifera) Queen Reproduction and Health: A Review." Insects 10, ... Putative Drone Copulation Factors Regulating Honey Bee (Apis mellifera) Queen Reproduction and Health: A Review. Insects. 2019 ...
Poultry researchers found that domestic cockerels 'allocate sperm differently according to the quality of copulation'; new...
Educated Earth // Videos - Biology & Medicine - Human Copulation MRI
Tadapox Gives Surprising Efficacy during Copulation
Graduate Thesis Or Dissertation | Regulation by male-specific fruitless of neural circuitry used during courtship and...
Courtship and copulation behaviors in Drosophila melanogaster males are regulated by sex-specific products from the gene ... Regulation by male-specific fruitless of neural circuitry used during courtship and copulation behavior in Drosophila ... copulation success, and abdominal muscle development of EMS-mutagenized flies, resulting in one fly line in which homozygous ... males were impaired in their ability to initiate or maintain copulation. Further, I examined two characteristics, the initial ...
Male remating in Drosophila ananassae: evidence for interstrain variation for remating time and shorter duration of copulation...
Sisodia S, Singh B N (1996) Evidence for a positive correlation be-tween duration of copulation and fertility in Drosophila ... Eberhard W G (1994) Evidence for widespread courtship during copu-lation in 131 species of insects and spiders, and ... Male remating in Drosophila ananassae: evidence for interstrain variation for remating time and shorter duration of copulation ... ananassae: shorter duration of copulation during second mating as compared to first mating. J Biosci, 24: 427 431 ...
Size and age at first copulation and spawning of the apple snail, <i>Pomacea canaliculata</i> (Gastropoda:...
The size and age at first copulation and spawning of the apple snail, Pomacea canaliculata, were determined at three food ... However, age at first copulation was similar among snails at all food levels. The food level appeared to affect the penis ... Females fed at the low food level delayed both first copulation and spawning longer than those at higher food levels. ... Consequently, their sizes at first copulation and spawning were smaller. The albumen gland of poorly fed snails was smaller at ...
Zoosystematica Rossica - An instance of intergeneric copulation in the family Rhopalidae (Heteroptera): structure, functioning...
Caenorhabditis elegans Male Copulation Circuitry Incorporates Sex-Shared Defecation Components To Promote Intromission and...
However in the male, both neuron and muscle take on modified functions to promote successful copulation. Males require calcium- ... Caenorhabditis elegans Male Copulation Circuitry Incorporates Sex-Shared Defecation Components To Promote Intromission and ... Caenorhabditis elegans Male Copulation Circuitry Incorporates Sex-Shared Defecation Components To Promote Intromission and ... Caenorhabditis elegans Male Copulation Circuitry Incorporates Sex-Shared Defecation Components To Promote Intromission and ...
Ancient pheromone blend as an alternative for copulation in internally fertilizing salamanders [PeerJ Preprints]
... indicating that these molecules obviate the need for copulation in these salamanders. Surprisingly, our finding of side-by-side ... Ancient pheromone blend as an alternative for copulation in internally fertilizing salamanders. Ines Van Bocxlaer1, Dag Treer1 ... Ancient pheromone blend as an alternative for copulation in internally fertilizing salamanders. PeerJ PrePrints 2:e457v2 https ... indicating that these molecules obviate the need for copulation in these salamanders. Surprisingly, our finding of side-by-side ...
Displaying items by tag: copulation - The Inner Otter
Human reproduction - Wikipedia
Eagle copulation | The Coastodian
Sexual Assault: Definitions | Spartans for Safety | San Jose State University
Life Cycle of a Centipede
Earth Times: news/372538,australia-re-commits-exporting-uranium.html
Earth Times: show/laguna-guitars-launches-one-guitar-one-tree-reforestation-initiative,360155.shtml
Wikipedia talk:WikiProject Fishes/Archive 3 - Wikipedia
Canine reproduction - Wikipedia
... and the females mentally and physically become receptive to copulation. It is only during estrus that copulation will result in ... CopulationEdit. "Copulatory tie" redirects here. For copulatory tying in non-canine animals, see Fossa (animal) § Breeding, ... As with most tetrapods, canine copulation involves the male mounting the female from behind, a position that is referred to as ... Virgin dogs can become quite distressed at finding themselves unable to separate during their first copulation, and may try to ...
Testosterone and eye-brain asymmetry for copulation in chickens<...
Rogers, L. J. ; Zappia, J. V. ; Bullock, S. P. / Testosterone and eye-brain asymmetry for copulation in chickens. In: ... Rogers, L. J., Zappia, J. V., & Bullock, S. P. (1985). Testosterone and eye-brain asymmetry for copulation in chickens. ... Rogers, LJ, Zappia, JV & Bullock, SP 1985, Testosterone and eye-brain asymmetry for copulation in chickens, Experientia, vol ... Testosterone and eye-brain asymmetry for copulation in chickens. / Rogers, L. J.; Zappia, J. V.; Bullock, S. P. ...
best medicine to enhance copulation time alongwith their cost in india. how long the medicines to be used? what is the minimum...
best medicine to enhance copulation time alongwith their cost in india. how long the medicines to be used? what is the minimum ... best medicine to enhance copulation time alongwith their cost in india. how long the medicines to be used? what is the minimum ... best medicine to enhance copulation time alongwith their cost in india. how long the medicines to be used? what is the minimum ...
Males10
- In males, the act of copulation is more complex, because some learning is necessary, but the innate processes (retrocontrol of penis intromission in the vagina, rhythmic movement of the pelvis, detection of female pheromones) are specific to copulation. (wikipedia.org)
- Courtship and copulation behaviors in Drosophila melanogaster males are regulated by sex-specific products from the gene fruitless (fru). (oregonstate.edu)
- 25°C). Males fed at a low food level started copulation at smaller sizes than males at higher food levels. (go.jp)
- While the majority of rapes are committed by males against females as acts of vaginal penetration, the term "sexual assault" includes other acts of sexual violation, such as unwanted touching and/or molestation, assaults perpetrated against males, acts committed with foreign objects, forced oral copulation, forced sodomy. (sjsu.edu)
- Males engaged in copulation, flehmen and mounting more with oestrous cows who conceived than with those who failed to conceive. (ac.ke)
- The change in mating behavior that results from inhibition of Obp56h expression is accompanied by significant alterations in cuticular hydrocarbon (CHC) composition, including reduction in 5-tricosene (5-T), an inhibitory sex pheromone produced by males that increases copulation latency during courtship. (g3journal.org)
- We found that males from the high mating frequency SPR- populations evolved decreased ability to inhibit the receptivity of their mates and decreased copulation duration, in line with predictions of decreased per-mating investment with increased sperm competition. (nih.gov)
- The mating inhibition after repeated copulation (sexual satiety) and its re-commencement after changing the sexually active partner (Coolidge effect) are well recognized phenomena in males, but their occurrence in females is little explored. (czaw.org)
- Subordinate males allocate high numbers of sperm to initial copulations, regardless of female availability or quality. (wwnorton.com)
- Courtship before intromission is generally quick and tactile, but there are some cases in which males offer a glandular secretion produced in their chelicerae before copulation as a nuptial gift for their mates. (biomedsearch.com)
Courtship and copulation2
- Further, FRU[superscript M] likely directs multiple downstream targets, in different subsets of neurons in which it is expressed, which collectively provide correct development of neural circuits underlying courtship and copulation behavior. (oregonstate.edu)
- Several general behaviors have been described including seasonal sexual segregation, courtship and copulation. (springer.com)
Drosophila4
- This is the first report in the genus Drosophila which provides evidence for interstrain variations for male remating time as well as for shorter duration of copulation during second mating as compared to first mating in D. ananassae. (cogprints.org)
- Mating latency, duration of copulation and fertility in four species of the Drosophila bipectinata complex. (bvsalud.org)
- Significant interspecific variations in mean duration of copulation and fertility were observed in four species of the Drosophila bipectinata species complex. (bvsalud.org)
- Ovipositor Extrusion Promotes the Transition from Courtship to Copulation and Signals Female Acceptance in Drosophila melanogaster. (ox.ac.uk)
Mating15
- Before mating and copulation, the male spider spins a small web and ejaculates on to it. (wikipedia.org)
- Herein, we summarize the mating biology of honey bees, the changes queens undergo during and after copulation, and the role of drone semen and seminal fluid in post-mating changes in queens. (mdpi.com)
- ananassae: shorter duration of copulation during second mating as compared to first mating. (cogprints.org)
- Here, we explore how components of the sex-shared defecation circuitry are incorporated into the sex-specific male mating circuitry in Caenorhabditis elegans to produce successful copulation. (g3journal.org)
- During the evolution of insects, an effective position during copulation promoted higher fecundity through control over the act of mating or elimination of competitors. (naturalis.nl)
- Usually during insect copulation, either twisting or flexing of the male abdomen occurs, and genitals remain symmetrically or asymmetrically disposed following changes in the mating position. (naturalis.nl)
- In field and laboratory studies of birds, positive associations between male phenotype and success at obtaining extra-pair copulations or extra pair fertilizations are often interpreted as providing evidence that females are using extra-pair copulations to obtain indirect benefits for their offspring, either through genes for increased viability, or for a fisherian mating advantage. (ox.ac.uk)
- This paper address the question of how important extra-pair copulations (ECP) in human mating strategies. (blogspot.com)
- Intersexual: Intrasexual: Female selects a mate -Male vs. Male Intrasexual: Intersexual: Intersexual: Intrasexual: before mating during and after mating Post-copulation: Pre-copulation: -Traits do not guarantee individual's ability to survive. (prezi.com)
- Similarly, D. malerkotliana showed negative correlation between mating latency and duration of copulation . (bvsalud.org)
- These results suggest that D. pseudoananassae has distant relatedness from the other three species with respect to mating latency, duration of copulation and fertility which supports the previous findings. (bvsalud.org)
- These two phenomena were compared in conditions when the female regulates copulation timing (pacing) and under non-paced mating. (czaw.org)
- In the non-paced mating situation there was a reduction in ear wiggling and hop/darting frequencies after 3 h of constant copulation. (czaw.org)
- Data are discussed by comparing the mating conditions and the sex differences in the effect of repeated copulation and partner replacement. (czaw.org)
- The mating pair interacts briefly before copulation, but the male touches the female both during and after penetration while she oviposits. (biomedsearch.com)
Females8
- Females fed at the low food level delayed both first copulation and spawning longer than those at higher food levels. (go.jp)
- 2. Estrus is the next stage, in which estrogen levels are high, mature eggs are released from ovaries, and the females mentally and physically become receptive to copulation . (wikipedia.org)
- These components are passed to females during copulation and then stored within the spermatheca. (biologists.org)
- Under such a model, females pursue extra-pair copulations as insurance against the functional infertility of their mate, and obtain only direct benefits for themselves in their current reproductive event. (ox.ac.uk)
- Females, it has become clear, are remarkably promiscuous and have evolved an astonishing array of strategies, employed both before and after copulation, to determine exactly who will father their offspring. (google.ca)
- Here, we show a novel role for ovipositor extrusion in promoting male copulation attempts in virgin and mated females and signaling acceptance in virgins. (ox.ac.uk)
- However, if the ovipositor is not subsequently retracted, copulation is prevented, as it happens with mated females. (ox.ac.uk)
- Females may lay their eggs immediately or in the months after copulation, and the oviposition strategies seem to be related to the length of the ovipositor. (biomedsearch.com)
Duration2
- The duration of copulation varies significantly between mammal species, and may be correlated with body mass, lasting longer in small mammals than in large mammals. (wikipedia.org)
- However, D. bipectinata showed positive correlation between duration of copulation and fertility . (bvsalud.org)
Behavioral1
- A detailed behavioral analysis revealed that during courtship, the male repeatedly licks the female genitalia, independently of ovipositor extrusion, and that licking an extruded ovipositor prompts a copulation attempt. (ox.ac.uk)
Fertility1
- I assessed fertility, copulation success, and abdominal muscle development of EMS-mutagenized flies, resulting in one fly line in which homozygous mutant animals had a novel muscle phenotype. (oregonstate.edu)
Male14
- In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into her reproductive tract. (wikipedia.org)
- However in the male, both neuron and muscle take on modified functions to promote successful copulation. (g3journal.org)
- As with most tetrapods , canine copulation involves the male mounting the female from behind, a position that is referred to as " doggy style " but does not have a specifically known origin. (wikipedia.org)
- Unlike human sexual intercourse , where the male penis commonly becomes erect before entering the female, canine copulation involves the male first penetrating the female, after which swelling of the penis to erection occurs, which usually happens rapidly. (wikipedia.org)
- Here we present the unusual case of a 'belly-to-belly' copulation, with symmetrically positioned male genitals and no twisting of the abdomen. (naturalis.nl)
- In the former case there is potential for incest: however, 70% of 30 copulations observed were between the dominant female of one pack and a male from an adjoining pack. (ox.ac.uk)
- Copulation, involving a subadult male ring-necked parakeet. (cabi.org)
- Genetic silencing of the descending neurons shows that ovipositor extrusion stimulates the male to attempt copulation. (ox.ac.uk)
- In this study, we reveal a dual function of the ovipositor: while its extrusion is necessary for initiating copulation by the male, its retraction signals female acceptance. (ox.ac.uk)
- We thus uncover the significance of the communication between male and female that initiates the transition from courtship to copulation. (ox.ac.uk)
- 1. The male organ of copulation in higher vertebrates. (thefreedictionary.com)
- the male organ of copulation and, in mammals, of urinary excretion. (thefreedictionary.com)
- The male organ of urination and copulation. (thefreedictionary.com)
- Copulation is often followed by a period of mate guarding in which the female is held or constantly touched by the male (see table 12.1 in Machado & Macias-Ordonez 2007). (biomedsearch.com)
Insemination2
- Human reproduction normally begins with copulation, followed by nine months of pregnancy before childbirth, though it may be achieved through artificial insemination . (wikipedia.org)
- Firm matching of genitals during copulation is of critical importance to effective insemination and thus, gene flow. (naturalis.nl)
Species2
- Copulation has been directly observed in captive settings for several species of elasmobranchs in large aquaria, and in the wild for three species of urolophids and for Triaenodon obesus and Ginglymostoma cirratum . (springer.com)
- In this paper, we investigate the reproductive behavior of the gonyleptid Chavesincola inexpectabilis Soares & Soares 1946 (Heteropachylinae) and provide basic descriptive information about courtship, copulation, oviposition, and paternal care of this species. (biomedsearch.com)
Female2
- courtship involves inducing the female to take up the sperm package into her genital opening, but there is no actual copulation. (wikipedia.org)
- In most female mammals, the act of copulation is controlled by several innate neurobiological processes, including the motor sexual reflex of lordosis. (wikipedia.org)
Genitalia1
- Investigating the functional morphology of genitalia during copulation in the grasshopper Melanoplus rotundipennis (Scudder, 1878) via correlative microscopy in Journal of Morphology, 278 (2017) 334-359. (kit.edu)
Fertilization2
- Internal fertilization with many vertebrates (such as reptiles, some fish, and most birds) occurs via cloacal copulation, known as cloacal kiss (see also hemipenis), while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization. (wikipedia.org)
- It's nice to see that at least some animals are maximizing their chances of successful fertilization with each bout of copulation. (scientificamerican.com)
Penis1
- [ citation needed ] During copulation, and only after the male's penis is fully inside the female's vagina, the bulbus glandis becomes engorged with blood. (wikipedia.org)
Pheromones1
- Here we show that uncleaved glycosylated SPF protein pheromones, secreted during courtship, are sufficient to elicit such behaviour in palmate newts (Lissotriton h. helveticus), indicating that these molecules obviate the need for copulation in these salamanders. (peerj.com)
Mammals1
- Genital interactions during simulated copulation among marine mammals in Proceedings of the Royal Society B: Biological Sciences, 284 (2017) 20171265. (kit.edu)
Genetic1
- We raise the possibility that extra-pair copulations may be widespread in canid societies and that the monogamy supposedly fundamental to the family may be more sociological than genetic. (ox.ac.uk)
Frequency1
- Castration or partial castration also reduces the frequency of courtship, copulation, and aggression. (nih.gov)
Oral2
- Oral copulation is the act of copulating the mouth of one person with the sexual organ or anus of another person. (sjsu.edu)
- The law, which dates back to 1805, makes it a crime against nature to engage in "unnatural copulation" -- a term New Orleans cops and the district attorney's office have interpreted to mean anal or oral sex. (jwz.org)
Alouatta1
- Extra group copulations are rarely observed among the Alouatta genus, which lives in a fragmented area in Brazil . (bvsalud.org)
Animals1
- In one of the latest episodes of 'Wild Sex', I discuss the fact that in certain animals the processes of ovulation and copulation are coupled. (scientificamerican.com)
Processes1
- These innate processes direct heterosexual copulation. (wikipedia.org)
Reproduction1
- Over a period of 2 1/2 years the occurrence of flehmen, mounting and copulation among members of a semi-wild cattle herd was recorded and their relationships to age, sex and stage of reproduction studied. (ac.ke)
Brazil1
- Here, we describe the second extra group copulation in A. caraya in literature , which was the first from Brazil . (bvsalud.org)
Pregnancy1
- It is only during estrus that copulation will result in pregnancy . (wikipedia.org)
Time1
- best medicine to enhance copulation time alongwith their cost in india. (ayurvediccure.com)
Group2
- We discuss the possible issues that led to the extra group copulation . (bvsalud.org)
- Nevertheless, extra group copulation (EGC) was only reported in A. pigra (Horwich, 1983), A. seniculus (Agoramoorthy & Hsu, 2000), A. guariba (Fialho & Setz, 2007) and A. caraya (Kowaleski et al. (bvsalud.org)
Subject1
- Is the Subject Area "Copulation" applicable to this article? (plos.org)