I recently hooked up with a man at a gay bar. We went back to the hotel and had oral sex 3 times. Although I know oral sex is a low risk activity for hiv/aids, i am concerned because he precame in my mouth a lot each time (although did not actually cum in my mouth). The third time we had oral sex, he had an abrasion on his penis that I noticed, and although it wasn't dripping in blood, it was definitely a cut. That night we hooked up I also had a canker sore on my tongue. Is it possible that I became infected with hiv through his blood or precum that could enter my blood stream from my canker sore. I am very concerned, and although I asked him if he was hiv positive and he replied no, I am still very preoccupied.