It also depends where you go with a girl. If you bring her to a restaurant, the chances are one of you will pay.
A better idea would be to walk around with her at a village area somewhat close to where you live (there's tons of places like this all over, especially in the summer). Have her meet you at your house if possible. Pick something up while you're walking around that area. Chances are it'll be more fast food-ish. Thus, you order separately and you don't even have to bring up splitting the bill or paying. Then walk around a little more and bring her back to your house and bang her.
If a girl says something like "you pay for me," say something like "you get us this time, I'll get us the next." If she keeps pushing, playfully cite equal rights. You'll find out what of girl she is real fast after that one.
Field tested