Most sexually active teenagers would have unprotected sex.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control*; D000293:Adolescent; D002648:Child; D003267:Contraception; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012736:Sex Education; D012725:Sexual Behavior