19236reproductionPT0000-00-00 00:00:00BT19275physiologyPTNT19792climactericPTNT19324coitusPTNT19774fertilityPTNT19279fertilizationPTNT19225laborPTNT19780menstruationPTNT19777oogenesisPTNT19783orgasmPTNT19223pregnancyPTNT19794pubertyPTNT19784sexPTNT19786sexual behaviorPTRT19140birth ratePT