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Oral sex
The risk of transmitting HIV by oral sex is much less certain. The UK body which monitors rates of HIV estimates that about 1-3% of all sexual transmission of HIV is due to oral sex.
However, the evidence is conflicting, with some doctors and studies suggesting that as many as 8% of HIV infections are due to oral sex, and others putting the figure much lower, even at zero.
It seems that if there is a risk from oral sex, it is much lower than the risk from unprotected anal or vaginal sex. Having a very high viral load, an untreated STI, ejaculating in the mouth of the person sucking and the presence of sores or wounds in the mouth of the person sucking seem to increase the risk.