Spit? Swallow? Or just stand back?!

[fredv3b]

You exchange bodily fluids when he ejaculates in your mouth, well actually precum counts too so it's earlier than that. Your stomach is full if acid and will kill off anything that you swallowed. So HIV (and the others) have to take advantage of any cuts or abrasions to the lining of the mouth and gullet. The latter is not very likely unless you have problems down there, or have recently swallowed something sharp. So to be honest, the extra risk of swallowing rather than spitting is probably very small. What's more important is whether you practice safe or unsafe oral sex.