Of all the issues our experts are asked about, none is the source of more unwarranted freak-outs than kissing. The act of kissing on its own carries no risk for HIV. It doesn't matter whether it's a peck on the cheek or deep tongue-on-tongue action. (And no, you can't transmit HIV through cold sores.)
The only kissing scenario that would involve even a remote risk would be where fresh blood was exchanged -- and unless you're dating a vampire, that kind of thing is extremely unlikely to happen.
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