Way I've been brought up is that the guy pays - regardless. I've always been seeing around the forums that it's not the best thing to do.
In my opinion, letting the girl pay is huge dlv, even if it's just a small portion. The couple of times (literally, couple) I've allowed a girl to pay made me feel like a loser (side note - we Russians actually have a word for a man who's financially dependent on a woman!).
However, I haven't had any issues in terms of closing either way. Guess it's more of a personal/inner game thing. What are your thoughts?