ok, thanks so much for the answer. 
pero anong "fun" dun? hindi ba waste of time lang yun? unless wala silang ginagawa sa life... right? and what would be the consequences, if ever? just curious...
Flirting is not a real waste of time. It can be a breath of fresh air to break the monotony of everyday life and interact with other people, especially of the opposite sex. During a conversation, it also forces you to think of a crafty response on the spot. Being spontaneous, witty and an interesting individual is a very difficult balance to achieve.
Lets say you forbid your boyfriend to flirt, that is an easy indication that you do not have enough trust in him to know the limits. Forget the stereotype of bar-style flirting. I think its safe to assume that most, if not all women know guys only go to bars for two things, to get drunk or find some random chick to get laid. People flirt in most places and sometimes they are not even aware of it.
As far as consequences, do you honestly think that forbidding something for your boyfriend will actually stop it? It will actually encourage it. Look at it this way, look back at anything that your parents have forbidden you to do, have you ever always followed the rules? I think everyone here bent those rules at least once, so the more you make a huge deal out of it, the more he'll do it and he'll be harder to catch each time. Just trust in the person enough that he knows his boundaries. It is the wisest thing to do.
