A significant proportion of MSM self-identified as either heterosexual or bisexual, and many were married or had at least one female sexual partner in the preceding six months. These results were consistent with a previous knowledge, attitudes, and perceptions study of MSM in Malawi[20]. Concurrency of sexual relationships, which has been posited by many investigators as a key driver of heterosexual transmission in this region, appears to be relevant to MSM as well[11,12].