Sexual frequency and contraceptive pills.
D000328:Adult; D002986:Clinical Trials as Topic; D003276:Contraceptives, Oral / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008297:Male; D008656:Mestranol / Q000494:pharmacology; D009640:Norethindrone / Q000494:pharmacology; D009948:Orgasm / Q000187:drug effects; D010919:Placebos; D012725:Sexual Behavior / Q000187:drug effects*; D013223:Statistics as Topic
D003276:Contraceptives, Oral; D010919:Placebos; D008656:Mestranol; D009640:Norethindrone