Why are pretty girls always friends only of other pretty girls?

They dont want ugly girls around them for reputation
The ugly girls dont want thier friendship
Ugly girls are more immature, and pretty girls dont want them
Guys select the pretty girls, so its natural thar they know each other
Pretty girls have same interest (make up, stds, contraceptives, etc) which ugly girls have not
Pretty girls work togehter at diners, etc
Select gender and age to cast your vote:
Why are pretty girls always friends only of other pretty girls?
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