CoitusCoitus InterruptusCopulationMasturbationSexual BehaviorLabor OnsetPenisSemenSperm TransportPenile ErectionUnsafe SexSexual PartnersHomosexuality, MaleVaginaPregnancyOvulationSexually Transmitted DiseasesSexual AbstinenceContraception BehaviorHeterosexualityDyspareuniaAdolescent BehaviorLubricantsHIV InfectionsSex EducationContraceptive Devices, MaleHomosexualityUterusOrgasmSafe SexPregnancy in AdolescenceTime FactorsContraceptionBisexualityHealth Knowledge, Attitudes, PracticeHIV SeropositivityNatural Family Planning MethodsSexually Transmitted Diseases, ViralQuestionnairesErectile DysfunctionCondoms, FemaleOvulation DetectionContraception, PostcoitalSexualityRapeContraceptives, PostcoitalRisk FactorsEroticaCross-Sectional StudiesSexual Dysfunctions, PsychologicalPregnancy, UnwantedCoercionGenitalia, FemaleLogistic ModelsStudentsPregnancy, UnplannedSubstance-Related DisordersExtramarital RelationsAnus DiseasesSexual Dysfunction, PhysiologicalTolonium ChlorideMenstrual Hygiene ProductsUnited StatesAge FactorsSex OffensesPrevalenceReproductive MedicineSingle PersonContraceptives, Postcoital, SyntheticAcquired Immunodeficiency Syndrome