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ContraceptionContraceptive AgentsContraceptive Agents, FemaleContraceptive Devices, FemaleIntrauterine DevicesPregnancy, UnplannedContraceptives, OralContraception BehaviorContraceptives, Oral, CombinedContraceptives, Oral, HormonalContraceptives, Oral, SyntheticContraceptive DevicesContraceptive Agents, MaleFamily Planning ServicesDesogestrelEthinyl EstradiolNorgestrelLevonorgestrelContraceptives, PostcoitalMestranolNorethindroneVaccines, ContraceptiveSterilization, ReproductivePregnancy, UnwantedMenMedroxyprogesterone AcetateSpermatocidal AgentsContraception, PostcoitalIntrauterine Devices, CopperPregnancyMenstruationNorethynodrelContraception, ImmunologicEthynodiol DiacetateAbortion, InducedNorpregnenesEthinyl Estradiol-Norgestrel CombinationProgestinsContraceptives, Oral, SequentialContraceptives, Postcoital, HormonalSterilization, TubalAndrostenesHealth Knowledge, Attitudes, PracticeMenstrual CycleProgesterone CongenersParityIntrauterine Devices, MedicatedRisk FactorsContraceptive Devices, MaleSexual BehaviorDrug ImplantsPregnancy in AdolescenceMenstruation DisturbancesMegestrolSex EducationContraceptives, Postcoital, SyntheticTime FactorsFertilityCondomsOvulation InhibitionSpermatogenesis-Blocking AgentsTransdermal PatchMedroxyprogesteroneAge FactorsNorpregnadienesEthisteroneUterine HemorrhageEstradiol CongenersQuestionnairesMetrorrhagiaEstrogensCase-Control StudiesLogistic ModelsCoitusSexually Transmitted DiseasesCross-Sectional StudiesMarriageNonoxynolAbortion ApplicantsXanthurenatesCohort StudiesReproductive Health ServicesAbortion, LegalUnited StatesWomen's HealthSocioeconomic FactorsReproductive HistoryMen's HealthSexual PartnersSex FactorsCoitus InterruptusAmenorrheaBirth RateProspective StudiesPostpartum PeriodVasectomyChlormadinone AcetateCounselingDelayed-Action PreparationsKinetics