Contraceptives, Oral, HormonalIntrauterine DevicesContraceptive Agents, FemaleContraceptive AgentsContraceptives, OralContraceptive Devices, FemaleContraceptives, Oral, CombinedIntrauterine Devices, CopperContraceptive DevicesContraceptionContraceptive Agents, MaleContraception BehaviorContraceptives, Oral, SyntheticMedroxyprogesterone AcetateIntrauterine Device MigrationIntrauterine Devices, MedicatedUterine PerforationIntrauterine Device ExpulsionSpermatogenesis-Blocking AgentsDesogestrelPregnancy, UnplannedLevonorgestrelPelvic Inflammatory DiseaseNorprogesteronesFamily Planning ServicesEthinyl EstradiolTransdermal PatchUterine HemorrhageSalpingitisPlasticsMenorrhagiaActinomycosisProgestinsNorgestrelContraceptives, Postcoital, HormonalForeign-Body MigrationLactobacillus fermentumContraceptives, PostcoitalPregnancyAfrica, SouthernActinomycesMestranolNorethindroneContraceptive Devices, MaleDevice RemovalMenstrual CycleVaccines, ContraceptiveAfrica, EasternSterilization, ReproductiveSexual BehaviorFollicular PhasePregnancy, UnwantedUterusContraception, PostcoitalSpermatocidal AgentsEstrogensRisk FactorsCervix UteriMenstruationNorethynodrelHIV SeropositivitySpermatogenesisEthynodiol DiacetateAbortion, InducedContraception, ImmunologicNorpregnenesEthinyl Estradiol-Norgestrel CombinationTestosteroneCopperContraceptives, Oral, SequentialQuestionnairesSterilization, TubalCross-Sectional StudiesDevice ApprovalAndrostenesHIV InfectionsProspective StudiesProgesterone CongenersParityHealth Knowledge, Attitudes, PracticeDrug ImplantsMenstruation DisturbancesPregnancy in AdolescenceMegestrolContraceptives, Postcoital, SyntheticSex EducationOvulation InhibitionMedroxyprogesteroneFertilityCondomsNorpregnadienesEthisteroneMetrorrhagiaEstradiol CongenersEquipment DesignNonoxynolHIV-1CoitusAbortion ApplicantsTime Factors