Why do girls always go to the bathroom in groups?

d8880
I'm having a serious debate with a girl about abortion and she notices 4 of her friends giggling on the way into the bathroom and tells me: "hold on I gotta go, I'll be right back" And rushes in to do who knows what.

Honestly I think you guys must have like the best toilets in the world to be laughing that much, Or you must have the bathroom walls lined with pictures of Justin Bieber to make you all giddy or something.

What's going on in there? Why do girls always go in groups?
Why do girls always go to the bathroom in groups?
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