Contraceptives, Oral, HormonalContraceptive Agents, FemaleContraceptives, Oral, CombinedContraceptive AgentsContraceptives, OralContraceptive Devices, FemaleContraceptive Agents, MaleContraceptionMedroxyprogesterone AcetateSpermatogenesis-Blocking AgentsContraception BehaviorNorprogesteronesPregnancy, UnplannedDesogestrelContraceptives, Oral, SyntheticTransdermal PatchLevonorgestrelEthinyl EstradiolContraceptive DevicesLactobacillus fermentumProgestinsAfrica, SouthernContraceptives, Postcoital, HormonalAfrica, EasternMenstrual CycleIntrauterine DevicesFamily Planning ServicesPregnancyFollicular PhaseNorgestrelContraceptives, PostcoitalWomen's HealthSexual BehaviorWomenCervix UteriMestranolNorethindroneRisk FactorsHIV SeropositivityEstrogensTestosteroneSpermatogenesisVaccines, ContraceptiveQuestionnairesCross-Sectional StudiesSterilization, ReproductiveHIV InfectionsPregnancy, UnwantedMenstruationAbortion, InducedContraception, PostcoitalSpermatocidal AgentsIntrauterine Devices, CopperProspective StudiesNorethynodrelParityNorpregnenesEthynodiol DiacetateContraception, ImmunologicEthinyl Estradiol-Norgestrel CombinationHealth Knowledge, Attitudes, PracticeContraceptives, Oral, SequentialWomen's Health ServicesSterilization, TubalHIV-1Pregnant WomenAge FactorsMenstruation DisturbancesBattered Women