Dowsett, Grierson and McNally. 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. Men who have sex with men may donate blood; No deferral, except for blood transfusions. Main article: Men who have sex with men blood donor controversy. Also, condoms are more likely to break during anal sex than during vaginal sex. Wikimedia Commons has media related to Gay sex.
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