Snakes and lizards have what is called hemipenes, which is essentially a two-headed penis. Two penises on one organism might sound pretty wild, but did you know it can occur on humans as well? About 1 in 5.5 million American men will be affected by a condition known as diphallia, resulting in two penises.Though diphallia is fairly rare on its own, actually finding someone who has the condition is made even more difficult by the fact that it usually accompanies highly deleterious congenital conditions, such as other duplicated organs or spina bifida. When the condition is severe, these defects are insurmountable.
http://www.iflscience.com/health-and-medicine/man-born-two-penises
