A week and a half ago I had this one night stand with this guy and now I am a bit worried about the possibility of contracting HIV. Basically, what worries me is, that at first he tried to enter me without a condom (he did not get in, but did touch my anus with his penis without going in). Then I told him to put a condom on and he did. But my worry is that is it possible that he left some precum on the opening of my anus and I might have contracted HIV via that? Hope someone will know the answer to that. I will go and have myself checked in three months time anyway (after the window period), but would be great to know the chances of getting HIV. Thanks K.
Yes like homerx said there is a chance, a small one but a chance. Remember the window period is actually 6 months if you use the ELISA testing method. Other methods like the P24 antigen test combined with the ELISA test are conclusive at 3 months but only a few places offer the P24 antigen test.