A few months ago I had a one night stand with a 40 y/o white f. I'm 27. I had protected sex twice with a condom. She provided the condoms, if that matters in assessing my risk. The first time I went limp after 3 minutes (I was drunk) and took the condom off and washed off in the bathroom. The condom was covering almost all of my penis when I took it off; maybe the very, very bottom of the shaft was exposed, but not for long because there was extremely little penetration because I was drunk. The second time I had sex until completion with another condom on, but pulled out before I came while holding the condom at the base of my shaft so it wouldn't come off.
I'm not really concerned about this. What I am concerned about is her "grinding" on top of me while we were both naked before the second time we had sex. I know grinding is a very, very low to nonexistent risk for HIV contraction, but I noticed two sores under the tip of the penis afterwards and I don't know whether they're linked to to the 1st episode of drunk sex or the grinding. They weren't bleeding sores; they were red and slightly cracked (like dry skin if you rub it a lot).
I tested negative for Gonorrhea and Chlamydia at 1 week (took antibiotics for both afterwards just to be sure), tested negative for HIV at 4 and 5.5 weeks (antibody test), and negative for Syphilis at 4 weeks.
What is my risk for HIV and other STDs? I'd appreciate everyone's input, especially Teek's.