From the Centers for Disease Control. Sexual behavior among high school students.
D000293:Adolescent; D000294:Adolescent Behavior; D000328:Adult; D003075:Coitus; D003268:Contraception Behavior / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D012309:Risk-Taking; D012725:Sexual Behavior / Q000208:ethnology / Q000706:statistics & numerical data; D012749:Sexually Transmitted Diseases / Q000453:epidemiology; D013334:Students; D014481:United States / Q000453:epidemiology