Why is a sorority girl like a doorknob?

Cause everybody gets a turn.
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How can you tell if a sorority girl has achieved orgasm?

She drops her nail file.
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What do you say to a sorority girl that won't give in?

"Have another beer."
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What's the difference between a sorority girl and a phone booth?

You need a quarter to use the phone.
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How many sorority girls does it take to change a light bulb?

She holds on to it, and the world revolves around her.