[Concept of sex].
D000028:Abortion, Induced; D012734:Disorders of Sex Development / Q000628:therapy; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008297:Male; D009017:Morbidity; D011247:Pregnancy; D011584:Psychology; D012723:Sex; D012727:Sex Characteristics; D012730:Sex Chromosomes; D012736:Sex Education; D012737:Sex Factors; D012742:Sex Offenses