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.