From the Centers for Disease Control. Patterns of sexual behavior change.
D000328:Adult; D001294:Attitude to Health; D001727:Bisexuality; D005500:Follow-Up Studies; D006679:HIV Seropositivity; D006716:Homosexuality; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012309:Risk-Taking; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology