What is MSM?

Men Who Have Sex With Men (MSM) refers to men who have a sexual relationship with other men. This term refers to homosexual men, bisexual men who have sex with other men, heterosexual men who have sex with other men, male sex workers who provide service to other men, female-to-male transmen who have sex with men, and other men who practice similar sexual activities as MSM regardless of their kinds of partners, for instances transsexuals, transgender or intersexual individuals.