Letter: Sex education in schools.
D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D007086:Illegitimacy; D008393:Marriage; D009520:New Zealand; D011247:Pregnancy; D012736:Sex Education; D012749:Sexually Transmitted Diseases / Q000453:epidemiology; D013548:Sweden; D014481:United States