Why do girlfriends wanna know how many girls we've fucked before?

Anonymous
This question got me thinking; why do girls want to know how many girls we've slept with before them?

I'm kinda curious, because this is a question I would never ask my girlfriend and would never want to know the answer to.
Updates
+1 y
So - where is the "cut off line" girls? At what count do you girls say to a guy "Damn, you are one nasty player. I'm breaking up with you"?

What's an acceptable number?
Why do girlfriends wanna know how many girls we've fucked before?
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