Pig in a poke

Stem cell researchers have proved that pigs are capable of growing human organs. Recently it was revealed that a man who lost his penis in a farming accident donated his stem cells and had a new organ grown. The only problem is it shrinks when it gets hot.

http://www.telegraph.co.uk/science/science-news/8584443/Pigs-could-grow-human-organs-in-stem-cell-breakthrough.html