Let's get this thing back on track. How often do you pay for dinner vs. your significant other? Did things change the further you got in your relationship?
Lady BR didn't pay for anything when she was in college but now pays for maybe 1 out of every 3 dinners out. Usually the relatively cheap ones though so I am still stuck with the large tabs.
If a girl insists on paying I usually let her pay for the less expensive meals - lunch, fast food, etc.... At dinner it's not really up for discussion.
When it comes to nights out on the town for drinks, I'll let her pay for every 3rd or 4th round if she is insistent about it. Definitely not 50-50 though.