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 ServicesFollicular PhaseNorgestrelContraceptives, PostcoitalSexual BehaviorPregnancyMestranolNorethindroneCervix UteriHIV SeropositivitySpermatogenesisVaccines, ContraceptiveEstrogensTestosteroneRisk FactorsSterilization, ReproductivePregnancy, UnwantedQuestionnairesHIV InfectionsCross-Sectional StudiesSpermatocidal AgentsContraception, PostcoitalProspective StudiesIntrauterine Devices, CopperMenstruationNorethynodrelEthynodiol DiacetateAbortion, InducedContraception, ImmunologicNorpregnenesEthinyl Estradiol-Norgestrel CombinationContraceptives, Oral, SequentialHIV-1Sterilization, Tubal