HIV risk among young men.
D002487:Centers for Disease Control and Prevention, U.S.; D015658:HIV Infections / Q000453:epidemiology* / Q000209:etiology* / Q000635:transmission; D015528:HIV Seroprevalence; D007722:Health Knowledge, Attitudes, Practice; D006306:Health Surveys; D018451:Homosexuality, Male / Q000523:psychology* / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D012307:Risk Factors; D012309:Risk-Taking; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology