How man 'lost his penile spines'
Scientists believe men once had small spines on their genitalia such as those found in chimpanzees, cats and mice.
Analysis of the genomes of humans, chimpanzees and macaques indicates that a DNA sequence thought to play a role in the production of these spines have been deleted in humans, but has been preserved in other primates. ...
And ladies across the world are very grateful. :D
OUCH. Men and their Evolving Nether Regions