Go up to a girl, catch her off guard..
YOu: I need to get a quick female opinion on something before i go find my friends..
Her: what..
You: What would you rather go for.. a guy who's good looking, athletic, and really nice, and makes decent money for his age, or a guy who's ok looking, not that nice, but is rich?
Her: (Assume she picks good looking guy)
YOu: Really?! well, my friend and i were just aving this argument, cuz his ex dumped him for a rich ugly guy.. What do you think of girls that just go for the money, are they superficial, or do they just want to live it up the most..
Her: blah blah
You: well, thats what i'm trying to explain to him.. its good to know that there's some smart attractive girls out there that can have a real convo in the middle of a bar/club.. Need to get back to my friends. (go back)

I usually don't do opinion openers, but once that regard relationshpis are always a hot topic for girls (regardless of how hot they are).. and if you can sneak a genuine complement (not regarding her looks) based on something she said, it really helps you out..

I am new to this type of approach, and usually hesititate in doing them, but i felt like sharing that one.. will try it again next weekend..

when i did it last weekend the girl was giving me looks the whole night.. its easier to just go up toher and dance .