I suggest you write to Dr Bob, the resident safer sex expert, at thebody dot com.
My thoughts are, the rougher the sex, the more likely to incur trauma of some sort, either to the cock or the throat. And of course, trauma increases the risk of HIV being passed from one to the other, weather it be the top or bottom. I don't want to start the debate again, but guys with foreskin are more at risk of catchinhg HIV than guys who are circed, not matter if they have an open cut or not.
Either way, I believe the CDC puts the risk (for receiving oral) at 1 in 10,000 for an unknown carrier and 3 in 10,000 for a known poz.
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