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Yes, it is possible that HIV can be passed if a man has anal sex with a woman without using a condom. HIV can be found in rectal mucous and enter the penis while having anal sex.
There are also other STIs that can be passed with unprotected anal sex. Have a look at our “Know your chances” page. It provides information on your chances of getting or passing an STI, depending on how you are having sex.
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This answer was posted on January 20, 2014