By Tim Collins For Mailonline. Biologists used innovative 3D scanning and engineering-inspired computer simulations to solve the case. It has never been understood why tigers, bears, wolves and others developed a baculum - a mineral stick-like bone through the middle of their penis glans. Some species of male mammals mate so frequently and for such prolonged periods that the bone is needed to ensure their penises survive the encounter.
Why don't humans have a penis bone? Scientists may now know
How penis bones help primates win the mating game – and why humans might have lost theirs
It seems to have evolved independently nine times in different mammal lineages but it has also subsequently been lost in many cases. Among primates, humans are the only ones without a baculum, although it is tiny in gorillas and chimpanzees. Men can therefore get away with shorter copulation times. The baculum allows prolonged penetration and it is normally only present in animals that mate for longer than three minutes. Humans evolved monogamy as a reproductive strategy, which — along with other social rules — reduces the risk of females mating with rival males. Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.
New Research Reveals Why Humans Don't Have A Penis Bone
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 between and 95 million years ago, according to new research from University College London. 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. In contrast, the aye-aye , a nocturnal lemur, copulates for around an hour at a time and has a very long baculum.
The penis. As you would imagine, different species have very different penises. The other function of a baculum is speed.