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You don't see it, as mentioned, not because men are squeamish about seeing other dicks, it's because the dick cannot be evaluated as a symbol of manhood or virility or desirability or whatever when it is flaccid. (If you were a male star wouldn't you want to put your best foot forward, so to speak?) And a penis in a state of arousal will never get a rating suitable for general release. Women's parts, on the contrary, need not be aroused to be appreciated fully.