>Butt shaped - which before we became bipedal WAS the target.  Animals -
including humans before they became civilized and decided to talk during
sex - use rear entry almost exclusively.  BUTTS were the target, so
BUTT-shaped would be the visual trigger.

Thank heaven we didn't evolve directly from mandrills...
http://sheldon.unl.edu/HTML/ARTIST/Kirsch_D/FFF.html


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