One night i had a bit too much to drink at a party and ended up giving a guy a blowjob. I was too drunk to really think about it and when he came I swallowed. What are the chances of getting an STD or an STI? I do know the guy so he wasn't a complete stranger but he does sleep with a lot of girls. I know it's not as risky as having unprotected sex but I'm starting to get paranoid. Please help.