I had an encounter with another man with an unknown sexual history. I did not plan or want anything to happen but we ended up lying next to each other in our underwear and there was a bit of dry humping and rubbing although very little. Our genitals rubbed through the underwear. I had some pre-cum, and I could feel he also had some, so basically it went through the underwear (both sides). As far as I can gather there is no chance of getting HIV, but what about STD's? Assuming that some pre-cum reached my genitals?
Thank you kindly in advance.