The downside to being a girl.

Not equal pay, having to carry

No, the downside is not buying your own drinks at the bar, but rather having the males you are with perpetually buy them.

Ok, so that's obviously not really a downside, but it sure makes it harder to keep track of how much you drink when you go out. So you think that you aren't drinking that much, and then in hindsight, you realize that no, you actually had way more than that.

That's not necessarily a good realization for a Saturday morning.