You SHOULD definitely trust him on this. You definitely should NOT seek medical attention to assess this, as I’m sure your drunken hookup only has your best interests at heart. Just forget it ever happened, and carry on with your daily routines. If you begin to feel itchy or burning “down there,” that’s probably nothing to worry about especially if you don’t mind crabs, sores and blisters.
Perhaps an IQ test ought to be mandatory before we let people have sex with each other. Do you agree?