So I hooked up with this guy about 4 weeks ago and we just had oral sex. I gave him a b*****b and that was it. He never ejaculated. What is my risk for infection seeing as I am unaware of his std status?
If there was no exchange of body fluids, you are safe. You could have been at risk if you had an open sore inside your mouth and had his semen in your mouth. Otherwise no chance. HIV is quite hard to catch, you probably know to avoid receiving unprotected anal sex, even without ejaculation, due to pre-cum from the 'top' partner and the risk of tearing inside the anus of the 'bottom' partner. Hence the advice to use and insist on the use by your partner of strong condoms at all times for anal.
if it happened 4 weeks ago, now you can go for a check and i think you will be fine as oral sex is considered as very low risk.
go to GUM and asking for a full screen test. HIV 4TH gen test is very accuracy after 4 weeks.
good luck
Hugo