structural:summarization, information:filtering
Men who have sex with men (MSM)

Men who have sex with men (MSM) refers to men who engage in sexual activity with other men, regardless of how they identify themselves; many choose not to accept social identities of gay or bisexual. The term was created in the 1990s by epidemiologists in order to study the spread of disease among men who have sex with men, regardless of identity. As a risk category, MSM are not limited to small, self-identified, and visible sub-populations. MSM and gay refer to different things: behaviors and social identities. MSM refers to sexual activities between men, regardless of how they identify whereas gay can include those activities but is more broadly seen as a cultural identity. MSM is often used in medical literature and social research to describe such men as a group for clinical study without considering issues of self-identification.

As with any sexual relationship, people may begin with various forms of foreplay such as fondling, caressing, and kissing, and may or may not experiment with other practices, as they see fit. Sex between males can include manual sex, frot, intercrural sex, oral sex and anal sex.