I recently had a sexual encounter with a random guy that I met in a bar. After deep kissing, I received some oral and I gave some, I also introduced my fingers in his anus and penetrated him wearing a condom. It never broke. I never saw in him any ulcer or sign of STD that would indicated me he had something. I do not remember to have asked if he had or not std's. None of us ejaculated during this encounter. I suspect of this guy being very promiscuous and I worry about the risk of having acquired some STD or HIV. In your expert opinion, could you tell me If I should be worried or not?