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and other STDs. Men in their 20s are more likely to be sexually active and are less likely to use condoms than teenagers.4 Their high-risk sexual behavior also leads to increased risk for disease: Half of all new HIV infections in the United States are among people younger than 25,5 and young men aged 20–24 have the highest rate of gonorrhea infection among all male age-groups.6 In contrast to adolescents, among whom rates of intercourse are declining, men in their 20s are at greater risk for HIV and other STDs than in the past: Recent reports show that HIV prevalence among young heterosexual men doubled between 1988 and 1993.7 Men in their 20s have relatively high rates of STD and HIV infection compared with younger men, and they are more likely to engage in risky sexual behaviors. These young men are often the hardest to reach for prevention, however, because they are no longer associated with institutions that traditionally provide prevention education. Little is known about whether young men carry the prevention messages that they received as adolescents with them as they age or where they obtain new information about the prevention of STDs or Carolyn H. Bradner, formerly a research associate at The Urban Institute, is currently a medical student at the University of Chicago’s Pritzker School of Medicine. Leighton Ku is a senior research associate and Laura Duberstein Lindberg is a research associate, both at The Urban Institute, Washington, DC. The preparation of this article was funded by the Charles Stewart Mott Foundation. The National Survey of Adolescent Males was funded with the support of the National Institute of Child Health and Human Development, with additional support from the Office of Population Affairs, the National Institute of Mental Health and the Centers for Disease Control and Prevention. Older, but Not Wiser: How Men Get Information About AIDS and Sexually Transmitted Diseases After High School