CoitusCoitus InterruptusContraceptionCopulationFamily Planning ServicesSterilization, ReproductiveMasturbationReligion and SexCatholicismContraception BehaviorLabor OnsetPregnancyUtopiasParanoid BehaviorVaccines, ContraceptiveContraceptive Agents, FemaleSexual AbstinenceBirth WeightContraception, ImmunologicContraceptives, OralIntrauterine DevicesSterilization, TubalContraception, BarrierPenisSexual BehaviorAbortion, InducedOvulation InhibitionSperm TransportPregnancy in AdolescenceSemenIntrauterine Devices, CopperContraceptives, Oral, HormonalPremature BirthPenile ErectionLevonorgestrelBirth RateInfant, Low Birth WeightFertilityAttitudeOvulationHistory, 20th CenturyUnited StatesHealth Knowledge, Attitudes, PracticeVaginaInfant, NewbornUterusCondomsBirth OrderBirth CertificatesSocioeconomic FactorsRisk-TakingAge FactorsTime FactorsLogistic ModelsQuestionnairesGestational AgeBirth IntervalsPregnancy OutcomeBirth InjuriesMultiple Birth OffspringMaternal AgeCongenital AbnormalitiesInfant MortalityDelivery, ObstetricPregnancy Complications