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Despite the fact that men who have sex with men (MSM) comprise <5% of the male U.S. population, 57% of all new HIV diagnoses in the U.S. occurred in MSM in 20071–3. Among MSM, HIV disproportionately affects African Americans. African Americans comprise approximately 13% of the total U.S. population and nearly an identical proportion of MSM in the General Social Survey (GSS). However, in 2007, 24.5% of reported HIV cases among MSM occurred in African Americans, and some CDC surveillance data suggest that HIV prevalence in African American MSM may be more than twice that observed in white MSM4. The reasons for this disparity are unclear. African American MSM do not clearly have higher levels of sexual risk behavior than white MSM5, 6. However, African American MSM tend to preferentially choose other African American partners7, 8 and, compared to HIV-infected white MSM, HIV-infected African American MSM are diagnosed later in the course of infection and less frequently initiate antiretroviral therapy4, 9, 10. Because knowing one’s HIV status leads to substantial changes in sexual risk behavior and antiretroviral treatment probably decreases the risk of transmitting HIV, these factors may partially explain the relatively high rates of HIV transmission among African American MSM.