How Men Lost Their Penis Spines - FoxNews.com Isn't evolution wonderful? Many mammals do have a barbed penis. As a fanfiction writer in the Star Wars canon, it's pretty well accepted that Devaronians have them too. And in fan fiction of the 'furry' variety, so do the canines and felines. Personally I am thankful for our present human conformation and the lovely gallery detailing the variety of penile splendour.