Gender binary Gender identity Men who have sex with men Sexual identity Sexual orientation Women who have sex with women. Main article: Sexually transmitted disease. Retrieved February 12, Men who have sex with men may donate blood; Temporary deferral. Archived from the original on September 28, Historically, anal sex has been popularly associated with male homosexuality and MSM. In some countries, homosexual relationships may be illegal or taboo, making MSM difficult to reach.
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