Teenage sex and birth control.
D000022:Abortion, Spontaneous / Q000453:epidemiology; D000293:Adolescent; D000367:Age Factors; D003267:Contraception / Q000379:methods; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D012736:Sex Education; D012725:Sexual Behavior; D014481:United States