While I've never seen any information presented on the question you ask, logic would dictate that the risk would actually be less in the type of deep throat fucking you describe than in what you describe as "vanilla oral sex." It would seem to me that the deeper into the throat the semen is deposited, the less likely the possibility of HIV transmission. It is my understanding that the most likely route of HIV infection from oral sex is through an opening (cut, sore, etc.) in the gums or mouth. But hey, I ain't no doctor.
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"Men never do evil so completely and cheerfully
as when they do it from religious conviction."
-Blaise Pascal
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