D_Harry_Crax
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If you were to be infected by giving oral to a hiv positive man (which is very rare) the most likely route of infection would be a cut, sore or lesion in your mouth. There is no additional risk from swallowing, providing your throat is healthy too. The virus is destroyed by the digestive system.
Ditto what MarkLondon said, but I would say "extremely rare" rather than "very rare." I tend to trust and therefore believe the European studies rather than the U.S. studies from our antisex (esp. anti-gay-sex) federal government.