HIV and men who have sex with men sexual activity with members of the same sex, regardless of how they personally identify themselves. Many MSM choose not to (or cannot for other reasons) identify as homosexual or bisexual. Similarly, the label excludes men who identify as gay or bisexual, but who have never had sex with another man, including many gay teenagers. The terms MSM and women who have sex with women (WSW) have been used in medical scholarship since at least 1990. But, the term has been attributed to Glick "et al.", because their usage in a 1994 study solidified the concept in medical terminology. MSM is
Men who have sex with men Men who have sex with men Men who have sex with men (MSM), also known as males who have sex with males, are male persons who engage in sexual activity with members of the same sex, regardless of how they identify themselves; many such men do not sexually identify as gay, homosexual or bisexual. The term "MSM" was created in the 1990s by epidemiologists to study the spread of disease among men who have sex with men, regardless of identity. The term "MSM" is often used in medical literature and social research to describe such men as a group for