Centers for Disease Control and Prevention. Syphilis caused by infection with Treponema pallidum is passed from person to person through direct contact with a syphilis sore; these occur mainly on the external genitals, or in the vagina, anus, or rectum. Advance Data from Vital and Health Statistics : 2. Gender binary Gender identity Men who have sex with men Sexual identity Sexual orientation Women who have sex with women. Female sex partners of men who have sex with men may donate blood; No deferral. January Learn how and when to remove this template message. Female sex partners of men who have sex with men may donate blood; Temporary deferral. Main article: Men who have sex with men blood donor controversy. A study reported that two large population surveys found "the majority of gay men had similar numbers of unprotected sexual partners annually as straight men and women.
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