When a girl buys you a drink?

I know guys are generally know to pick up the bill at the bar, but how common is it for a girl to buy the drinks? I went out with my buddy and his friends for his 21st last night, and it got me wondering.

I myself am pretty insistent about paying for my own drinks (more so the more I drink), or if someone buys a round I like to pick up the next round. I'll even buy the occasional random a drink just because, but sometimes it isn't received so well.

What are y'alls thoughts on this?
I'm a guy and I pay for the drinks, not the lady.
I'm a guy, and a free drink is a free drink.
I'm a girl, and I don't mind buying drinks.
I'm a girl, and guys pretty much always pay.
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When a girl buys you a drink?
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