From the Centers for Disease Control and Prevention. Trends in sexual risk behavior among high school students--United States, 1990, 1991, and 1993.
D000293:Adolescent; D000294:Adolescent Behavior; D005260:Female; D006801:Humans; D008297:Male; D012309:Risk-Taking; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D013334:Students / Q000523:psychology / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology