So women are generally prettier to look at under normal, clothed circumstances, and guys are somewhat less so. Yet when the pants are pulled down, another story is told. Women have the most grotesque genitals imaginable, reminiscent of some sort of parasitic science fiction monster. Men have dicks, which aren't the most graceful things, but at least they don't resemble the motherfucking sarlac pit.
Discus: Women have hideous, grotesque genitals in order to compensate for looking purty. Men have meh genitals to complement being meh looking overall.