For six years, scientists at the University of Texas at Austin conducted research to determine why women chose to have sex. Of the 237 reasons women provided, not one included a reference to the appearance of the penis itself. The women enjoyed what the penis could do, and they certainly seemed to enjoy situations in which a penis played an active role, but the simple thought of a man's penis didn't cause them to run for the bedroom with joy.

Women might never be visual creatures that stand in...