Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Men who have sex with men (abbreviated as 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 men 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. MSM is often used in medical literature and social research to describe such men as a group for research studies without considering issues of self-identification.

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