We get many questions related to oral sex and the risk for HIV acquisition. There is no question that the risk of getting HIV (either from receiving or giving) is very, very low and some experts have said there is no risk from oral sex at all. Here on this forum we have traditionally told our clients that the risk for getting HIV from a single episode of oral sex (in either direction) is at most, less than 1 in 10,000, IF the person one is having sex with has HIV. This estimate may be overly conservative. Neither of us has ever seen a person who got HIV through oral sex. The medical literature has several case reports in which oral sexual transmission MAY have occurred but, in our minds, is not definite.
As to your other questions. HIV transmission is a “numbers” game. By that I mean that the more virus one is exposed to, the more likely transmission is. We also know there is more HIV present in ejaculate than in pre-ejaculate but it is present in pre-ejaculate as well. The while risk is lower with only exposure to pre-ejaculate, how much lower is unquantified. As for other modifiers, there are no studies of the effect of duration on risk although it makes sense that the longer the exposure, the higher the risk. There is no evidence to suggest that sores or other problems in the mouth change the risk. Finally, there is no change in risk in terms of ethnicity per se. While on average HIV may be more common in an African American than a Caucasian, ethnicity in and of itself has not impact.
No matter how you slice it, the risk for getting HIV from oral sex is very, very low. Hope this helps. EWH
Reread the last 2 sentences in the Dr's 1st paragraph and you will see the answer to your recent question.
Sorry, I forgot one question, in your past experiences, have you ever met a patient that got infected thru oral sex? Thank you