men who engage in sexual behavior with other men, but do not necessarily identify as "gay," “homosexual” or "bisexual."

(MSM): A term used to denote men who engage in sexual behavior with other men; includes men who self-identify as heterosexual as well as those who self-identify as gay and bisexual (please note that in online politics, MSM is an acronym for mainstream media)

Terms is often used when discussing sexual behavior. Is inclusive of all men who participate in this behavior regardless of how they identify their sexual orientation. The acronym MSM is conventionally used in medical literature. Also used: Women who have Sex with Women (WSW).

a term created to include MSM who do not identify as gay or bisexual.

Men who have sex with men (MSM) is a term used to classify men who have sex with men, regardless of whether they self-identify as gay or bisexual. The term is intended to reference a particular category of people as a risk-group for HIV, and is considered a behavioural category. As this label can only be reliably applied where the sex of individuals is unambiguous, this term should be avoided for transsexuals, transgendered individuals and intersexuals, except in cases where it is clear that they engage in risk behaviors similar, or equivalent to the risk behaviors of unambiguous men having sex with unambiguous men.