The risk of HIV transmission during oral sex is very low, but not zero, conclude researchers from Imperial College and the London School of Hygiene and Tropical Medicine in the December 2008 issue of the International Journal of Epidemiology. The researchers attempted to identify all the relevant observational studies on the topic, but found that given the lack of data, it would be inappropriate to make summary estimates for the transmission risk through oral sex..."...The fact that infected study participants with solely this exposure have remained difficult to identify may suggest that indeed the contribution of orogenital intercourse to HIV incidence remains low."
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