Welcome to our Forum. Unfortunately, you have posted on the wrong site. Questions about HIV belong on the HIV prevention site. I will do my best to answer your questions with this reply but, if you have additional questions or follow-up they must be on the HIV Prevention site. Sorry
You are correct that among subgroups of people an African American crack user male who has sex with other men is more likely than average to have HIV. Despite that, there is no risk of HIV from the exposure you describe. Statistically, it is still unlikely that this person had HIV - most persons do not. Furthermore, the quoted figure for HIV risk, if one receives oral sex (including analingus) from an infected partner is less than 1 in 10,000 and, in my estimation that is too high. Many experts state there is virtually no risk at all from oral sex and both Dr. Handsfield and I agree. Neither of us on this site have ever seen or reading the medical literature of a convincing instance in which HIV was passed by oral sex.
As for other STDs of the bacterial STDs only gonorrhea and nongonococcal urethritis (NGU) are transmitted through oral sex; chlamydia is not and without an obvious sore or lesion on your partner’s mouth, the chances of syphilis and herpes is likewise tiny. If you have acquired gonorrhea or NGU you will most likely develop symptoms of urethritis (penile infection) such as urethral discharge or burning on urination in the next 3-5 days. Even if your partner had an STD (any STD and it is likely he did not), most exposures do not lead to infection. In your case, after a single exposure I would urge you not to worry. If you wish, you could go to your local STD clinic or health care provider to be tested at this time. If you seek testing the important tests are for gonorrhea at both the penis and the rectum and the anus, as well as a urethral smear for NGU.
I hope these comments are helpful. EWH