The last study I saw on the subject of HIV risk from oral sex said that about 5% of new HIV infections are in people who say that oral sex is the riskiest thing they do. This is based on several studies each involving thousands of guys worldwide, not a couple of trucker groupies.
Maybe these people are ashamed to admit that they bareback; maybe they are so high that they can't remember what they did; maybe they always suck to completion; maybe they only deepthroat guys with hardware in their dicks; maybe they only suck injectable drug users rather than truckers. Until such more detailed information is known there is still considerable doubt that oral sex is absolutely safe.
Deepthroat has got to be riskier than standard oral sex because of the softness of the throat tissues and hence the chance for microtears. Also, langerhans cells, the same ones that putatively make having a foreskin an HIV risk factor, are plentiful in the throat.
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