Diphallia, also known as penile duplication, may seem like it belongs in a science fiction novel, but health care professionals are well aware of this condition. Affecting one out of every five and a half million boys in the United States, diphallia is a rare medical condition with around 100 confirmed reports since Johannes Jacob Wecker discovered it back in 1609.
Experts are unsure of what causes diphallia, but speculate it occurs after the 23rd day of gestation following an injury, chemical stress, or a gene malfunction. Unfortunately, men born with this condition tend to die at an earlier age due to infections and renal failure. Although both penises are able to function on their own, men with diphallia are usually sterile due to congenital defects. These men are also at a higher risk of developing spina bifida, a condition that results in malformation of the vertebrae designed to protect the spinal cord.
Caroline Bankoff rounds up “universal lessons” from the anonymous poster’s Ask Me Anything thread:
People are slightly more accepting of differences than you’d expect: In response to a question about how women react to seeing two penises on one guy, DoubleDickDude wrote, “It varies from girl to girl. Some have been like WOW. some have been like THATS FAKE! some have freaked out like, called me names. Most are pretty curious, but i dont have casual sex anymore, i stopped a few years back. Didnt like the empty feeling inside after a 1 night stand. did a lot of those in my late teens. A LOT of them. but for the most part, girls were nervous and some changed their mind at the last minute. dudes NEVER change their mind, they always want it even if they’re freaked out a little. lol”