HIV

I had unprotected oral sex, and I'm worried about HIV

Anonymous
asks:
About 4 months ago, I had unprotected oral sex with a guy that I know has been with at least a few other girls. The question of protection or other sexual partners never came up, although he knew that I was a virgin and that he was not. I was worried about my risk for HIV, again, I do not know his history. I have had no testing or symptoms as of yet....

I had unprotected sex! Could I have a STI? What should I do?

anonymous
asks:
I had unprotected sex (mistake #1) with an older guy who I don't know at all (mistake #2), but he didn't have any sores on his penis, and we only had sex for like 25 seconds, if that. If he didn't ejaculate in me and didn't have any sores, could it still be likely that I get a STD from him? He said he doesn't have any STDs, but people lie, and I'm obviously nervous....