Many times when I had a girlfriend and went out to clubs with my mates. Problem is if you brush off a girl and tell her you're taken, she tries harder to get you. Last night I hooked up with my new housemate in a club (I'll regret it) and was waiting outside the girls' loo for her, this hot Australian girl was chatting to me getting flirty and touchy, asking if I was waiting for my girlfriend. Could have had her but I turned her away.