QUOTE (melech @ Mar 6 2008, 09:32 PM)

Ignoring the chukat hagoyim issue, one explanation is because of how one is intimate. Women spread their legs when being intimate and therefore the space between her legs imitates being intimate, and therefore, according to the argument, it's forbidden to show that space between her legs in public since it's not modest to do so, something that doesn't apply to men since they don't normally spread their legs in that way when being conjugal so showing the space isn't imitating intimacy for men.
spreading of legs by a woman is much more of a modesty problem when they are wearing skirts, wouldn't you say.
also, men use their testicles which are there on display for the whole world to see all too often underneath the pants.