Quote:
Originally Posted by Rhesus
The viral particles are present in all bodily fluids, so theoretically one can contract HIV even by kissing someone (and ingesting the other's saliva). Remember though that chances of contracting HIV through normal vaginal sexual contact are in the range of .1% per coitus. The viral load in saliva is probably a lot lower, which is why the chance of contracting it that way is negligibly small. There is no documented case of HIV contraction in that way.
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I have heard it said that, on average, one would have to ingest about 37 liters of saliva to become infected
Edit: the chance of infection through unprotected sex is rather higher for women, by the way. Also, other STDs increase chances of infection (by fucking up the skin).