HIV acquisition and transmission among men who have sex with men and women: What we know and how to prevent it.

Men who have sex with men and women (MSMW) compose a subset of men who have sex with men (MSM) and represent an estimated 35% of MSM. Research on the HIV risk behaviors of MSMW has largely focused on their behaviors in comparison to men who have sex with men only (MSMO). Results suggest that compared to MSMO, MSMW are less likely to have ever had an HIV test, are at greater risk of being unaware of their HIV infection and are less likely to have encountered HIV prevention activities or materials. Additional research is needed to provide a more comprehensive understanding of the unique sexual behaviors and lived experience of MSMW as a group in order to better inform HIV prevention efforts. The purpose of this paper is to summarize existing data and discuss strategies to reduce HIV acquisition and transmission among MSMW.