Any flatworms in the audience?
Thankfully for humans, courtship doesn't involve figuring out which partner is male and female. Not so for the hermaphroditic flatworm, who settle their similarities with penis jousting contests. The winner gets to be the man in the relationship.
Penis Jousting and 7 Other Great Animal Mating Rituals – Wired Science from Wired.com (seen in the Web Clip box while reading work e-mail; I kid you not)
