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Old 06-24-2016, 05:45 AM
Chronos Chronos is offline
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Join Date: Jan 2000
Location: The Land of Cleves
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I suspect that it's closely related to the fact that our breasts are so much larger than those of our closest relatives (and correspondingly, than our fairly recent ancestors). We usually have big breasts because reasons, but we sometimes have breasts that are closer to chimp breasts (though very few women have breasts that are actually as small as a chimp's).

The same reasoning could be applied to the penis.