Why do women in short skirts/dresses feel they HAVE to cross their legs when they sit down?

I saw a video a few hours ago of a woman walking around in a short flared skirt and at the end, she went to sit down and crossed her legs BEFORE she even sat down!! I also see women in panel talk shows constantly sitting with their legs crossed. Why do you feel you have to do that? Unless you've got nothing on under that, it's NOT like anyone can see anything except MAYBE a nano-second glimpse of your panties. Big deal!!

Why do women in short skirts/dresses feel they HAVE to cross their legs when they sit down?
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