Why pretty girls get played so much?

I am a normal looking girl and I have a friend who is so pretty. I am in a relatioship and it,s all good. But she is so gorgeous an like NO LUCK with the guys..he meets a lot of guys..but seems liek they all want one thing from her. The thing is that the girl is not only pretty BUT smart since he has rreally high grades in college,. Can someone help me understand that phenomen..

Why pretty girls get played so much?
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