This factsheet , entitled HIV Among Gay and Bisexual Men explains how as a group, gay, bisexual, and other MSM have an increased chance of being exposed to HIV because of the large number of MSM living with HIV. Results of HIV testing conducted in 21 cities indicated that 19% of MSM tested in 2008 were HIV-positive and that HIV prevalence increased with increasing age and decreased with increasing education and income. Men aged 40 years and older were more likely than men aged 18–39 to have HIV.