High Quality Content by WIKIPEDIA articles! Men who have sex with men (MSM) are often prohibited from donating blood or tissue for transplantation because they are considered to be at high risk for HIV and some types of hepatitis, viruses that can be transmitted in blood transfusions. Restrictions on donors are often called "deferrals" since in some cases blood donors who are found ineligible may be accepted at a later date. The restrictions vary from country to country, and in many cases men are deferred who have not had sex with men for many years. MSM is a classification of men who engage (or have engaged in the past) in sex with other men, regardless of whether they identify themselves as homosexual, bisexual or heterosexual. The restrictions affect MSM and the female sex partners of MSM. They do not otherwise affect women, including women who have sex with women.

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