Birth control without contraceptives.
D001831:Body Temperature; D002582:Cervix Mucus; D003075:Coitus; D003267:Contraception; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008297:Male; D008598:Menstruation; D008722:Methods; D010060:Ovulation; D010507:Periodicity; D011247:Pregnancy; D012725:Sexual Behavior; D013997:Time Factors