Adolescent sexuality and pregnancy.
D000293:Adolescent; D003267:Contraception; D003710:Demography; D005260:Female; D006801:Humans; D009747:Nutritional Physiological Phenomena; D010551:Personality; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D000297:Psychology, Adolescent; D012725:Sexual Behavior; D014481:United States