Apparently your "friend" is, according to your own mentality/definition, a dirty male slut. (double standards, people, double standards!) Luckily for him, HIV is a pretty hard virus to catch. It can enter the body through the lining of the vagina, vulva, penis, rectum, or mouth during sex, and if he had any minor cuts on his penis, the fluids with HIV could have found a way of getting into his bloodstream. However, there may not have been enough HIV present to cause infection.
Keep in mind, early HIV infection often causes no symptoms. HIV antibodies usually don't reach detectable levels in the blood until one to three months following infection, and sometimes it can take the antibodies as long as six months to be produced in quantities large enough to show up in standard blood tests. Even if you test "negative" the first five months, it doesn't mean you're clean. But... odds are your friend doesn't have HIV (it's pretty rare... I talked to a nurse at UHS at U of M, and she said that during her entire 15 years with the University, she's only documented two cases of HIV), but he should still be checked regularly for the next year or so, just to be safe.
BTW, make sure your "friend" gets tested for EVERYTHING. He should really be more worried about other STDs (most without warning symptoms) that are more easily transmittable, such as chlamydia, herpes, HPV, etc.
<< as far as i know, the girl was a skank ho! i think he told me that she was a raver chick....and you know how that goes.... >>
Oh? And how does that go, Einstein?
Regarding raver chicks, I happen to be one (more of a club chick now, but I can still appreciate a good rave every now and then). A number of my friends are raver guys and gals, and neither I nor any of them engage in promiscuous behavior. Even for those who do, no judgment calls... it's perfectly fine to have fun, as long as you have fun safely.