you have to stop thinking of yourselves in terms of a "student" as in a school student in uni everyones an adult, and although it is frowned upon there aren't any rules about staff and students flirting etc, and i don't think it is really even frowned upon if he is a bouncer.
as people have said, talk to him, if you feel uncomfortable with his behavior(and it sounds liek you do) tell him , don't be rude, just say something casual "hey no offense mate but im a bit funny about you kissing me etc" and if hes a decent guy it should be sorted.
if you do like him and were just worried it is wrong, then stop worrying, if you liek maybe ask him when his night off is and invite him out for a drink or something.
have a quick flick over your unis rules and regs first though, maybe ask someone in confidence liek a personal tutor or soemthing if it is against uni regulations, but the fact he is flrting with you, and he knows the rules better than you, and wouldn't risk loosing his job(probably) suggests its probably all fine.