The men who have sex with men blood donor controversy is the dispute over prohibitions on donations of blood or tissue for organ transplants from men who have sex with men MSM , a classification of men who engage or have engaged in the past in sex with other men, regardless of whether they identify themselves as bisexual , gay or otherwise. Restrictions on donors are sometimes called "deferrals", since blood donors who are found ineligible may be found eligible at a later date. However, many deferrals are indefinite meaning that donation may not be accepted at any point in the future, thus constituting a de facto ban. Restrictions vary from country to country and in some countries practice of protected sex or periods of abstinence are not considered. The restrictions affect these men and, in some cases, any female sex partners.
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