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Kissing
One of the most enjoyable and universal forms of sexual play, kissing is also a virtually no-risk activity. Although there was some speculation that deep kissing could present a risk, this does not seem to be the case.
If you have sensitive lips, however, or become involved in rough kissing, you may find that your lips become cut, and that there is blood around. If that's the case, you should avoid oral sex and, if your partner's mouth is bleeding as well, kissing, until the lips stop bleeding. There is no risk from your partner's saliva – but you should avoid coming into contact with your partner's semen or vaginal fluid.