Women choose to be seen in their bikinis. Underwear is more private and girls generally don't want to be seen in it.
English
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Girls need to get some balls.
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I'm not so sure.. I mean I'd be extremely bummed if I had to deal with balls on girls too
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Seriously.
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If a girl chooses to post an underwear pic on facebook, she would be ridiculed by other girls for being a slut, attention whore, etc.
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Probably because girls don't show their bras/underwear willingly until they're about to get naked for someone.. usually implying sex. Chances are reputation is at work too.