ArousalSexual BehaviorSexual Behavior, AnimalRisk-TakingBehavior, AnimalSexual PartnersCopulationUnsafe SexCondomsSexually Transmitted DiseasesSleep Arousal DisordersAdolescent BehaviorFeeding BehaviorSexual AbstinenceCoitusEroticaSocial BehaviorHIV InfectionsHomosexuality, MaleSafe SexHealth BehaviorLibidoBehaviorQuestionnairesHealth Knowledge, Attitudes, PracticeExploratory BehaviorSexualityEjaculationOrgasmContraceptive Devices, MalePreoptic AreaHeterosexualitySubstance-Related DisordersBisexualitySleep StagesSleepAgonistic BehaviorSex EducationHomosexualityProstitutionExtramarital RelationsChild BehaviorAphrodisiacsStudentsReligion and SexCross-Sectional StudiesAggressionContraception BehaviorHibernationMaternal BehaviorRisk FactorsPrevalenceWakefulnessRisk Reduction BehaviorPeer GroupPolysomnographyCourtshipSex CharacteristicsConsummatory BehaviorAnalysis of VarianceHIV SeropositivityInterpersonal RelationsEmotionsElectroencephalographyMasturbationCompulsive BehaviorChild Behavior DisordersMotor ActivityParaphiliasSex FactorsSexual Dysfunctions, PsychologicalInterviews as TopicGalvanic Skin ResponseBehavior TherapyTestosteroneSleep, REMSelf DisclosureAppetitive BehaviorStereotyped BehaviorSocial EnvironmentLongitudinal StudiesMotivationTime FactorsBrainAlcohol DrinkingUrban PopulationAfrican AmericansAge FactorsSocioeconomic FactorsUniversitiesSingle PersonAnxietyCoturnixParasomniasPenile ErectionSexual Dysfunction, PhysiologicalLogistic ModelsSouth AfricaUnited StatesHomosexuality, Female