Contraceptives, Oral, HormonalEthisteroneNorgestrelContraceptive Agents, FemaleContraceptives, Oral, CombinedContraceptive Devices, FemaleContraceptive AgentsContraceptives, OralEthinyl EstradiolOximesEthinyl Estradiol-Norgestrel CombinationContraceptive Agents, MaleContraceptionMedroxyprogesterone AcetateAdministration, CutaneousSpermatogenesis-Blocking AgentsContraception BehaviorNorprogesteronesPregnancy, UnplannedTransdermal PatchDesogestrelContraceptives, Oral, SyntheticLevonorgestrelContraceptive DevicesLactobacillus fermentumProgestinsAfrica, SouthernContraceptives, Postcoital, HormonalAfrica, EasternMenstrual CycleIntrauterine DevicesFamily Planning ServicesFollicular PhaseContraceptives, PostcoitalSexual BehaviorPregnancyMestranolNorethindroneCervix UteriHIV SeropositivitySpermatogenesisVaccines, ContraceptiveEstrogensRisk FactorsTestosteroneSterilization, ReproductivePregnancy, UnwantedQuestionnairesHIV InfectionsCross-Sectional StudiesSpermatocidal AgentsContraception, PostcoitalProspective StudiesIntrauterine Devices, CopperMenstruationNorethynodrelEthynodiol DiacetateAbortion, InducedContraception, ImmunologicNorpregnenesContraceptives, Oral, SequentialHIV-1Sterilization, Tubal