Term	Definition
Bisexual	Men who self-identify as being sexually attracted to men and women
Club drugs2,3	Drugs such as cocaine, methamphetamine, Ecstasy, LSD, rohypnol, and ketamine; they are primarily associated with use at dance clubs
Gay/homosexual	Men who self-identify as being sexually attracted to men
Heterosexism	Practices or beliefs based on the assumption that all persons are heterosexual; for example, patient intake forms that lack options for partners (as opposed to spouses) and assuming that all males have female sex partners
Heterosexual	A person who is sexually attracted to partners of the opposite sex; some MSM may self-identify as being heterosexual
Internalized homophobia4,5	Negative feelings about homosexuality that are turned inward by persons with same-sex attraction
Men who have sex with men	A term that focuses on behavior rather than labels and is inclusive of all MSM, whether they self-identify as gay/homosexual, bisexual, or heterosexual
Sexual minority stress4,5	The theory that sexual minorities, including MSM, are stressed by prejudice, expectations of rejection, internalized homophobia, and concealment of their feelings in response to societal expectations; such stress may explain in part the disproportionate incidence of mental health issues in MSM