- Joined
- May 29, 2013
- Messages
- 21,005
- Reaction score
- 2
Scientists have discovered why humans do not have a penis bone, unlike chimpanzees, bears and most other mammals.
The penis bone, or baculum, first evolved in mammals around 145 and 95 million years ago, according to new research from University College London.
The study’s lead author Matilda Brindle told The Independent one of the reasons humans had lost their penis bone was because we do not have sex for long enough to need one.
“The common ancestors of both primates and carnivores had a baculum,” she said. “Humans are quite weird as we’re one of the few primates that doesn’t have one”
Primates who mate for three minutes or more tend to have far longer penis bones than those whose intromission, or vaginal penetration, is below three minutes, she said.
“The human intromission duration tends to be below two minutes, which most people wouldn’t expect.”
Chimpanzees, who only have sex for around seven seconds at a time, have a very small baculum, suggesting that there might be evolutionary pressure among apes to lose the penis bone.
http://www.independent.co.uk/life-s...doesnt-last-long-enough-ucl-why-a7473401.html