Men who have sex with men.

Abstract

Men Who Have Sex with Men Although estimates vary, men who have sex with men (MSM) are estimated to represent about 7% of the U.S. male population (Lieb et al., 2011; Purcell et al., 2012). MSM account for the majority of people infected with HIV in the United States. In 2010, MSM accounted for 78% of new HIV infections among U.S. men (CDC, 2015) and an estimated 56% of persons living with an HIV diagnosis (CDC, 2015).