Penis Bone
The Penis Bone or "bacula" is a bone found in the penis of several mammals. Despite slang terms that imply otherwise, the human penis contains no bones.
Why???
It can be as long as a finger in a monkey. In the walrus, it can be two feet long. But the human male has lost it completely. And researchers are a little stumped.
History
The Penis Bone first showed up in mammals around 95 million years ago. Most researchers think that it became a thing for reproductive strategy. See, most mammals back then had sex for like seven seconds. Wham, Bam, Thank you ma'am.
This shortness of sexual happy time was a poor strategy as such short time periods allowed for other mates to jump on for a ride, making it so that the previous mate's DNA would not be passed on. Slowly, but surely, mammals began evolving a bone that would keep the male member harder for a longer period of time, ensuring that other mates couldn't get in there and screw things up.
Far from simply being a nice way to spend an afternoon, prolonging intromission like this is a way for a male to prevent a female from sneaking off and mating with anyone else before his sperm have had a chance to work their magic. 
But Humans Don't Have One
Yep, humans don't have a penis bone. Chimps and other higher primates have them, but us guys don't. The reason? Another reproductive strategy. See, sometime around the time of the last ice age, about 1.9 million years ago, humans began to move towards monogamy.[1] Single mates, as a strategy, prevents some other potential mate from getting sloppy seconds.
With the reduced competition for mates, you are less likely to need a baculum,” he added. “Despite what we might want to think, we are actually one of the species that comes in below the three minute cut-off where these things come in handy.[2]
While there are a ton of sluts and man-whores out there fucking everything that moves, the vast majority of us tend to just stick with one mate.[3] Whether this is out of laziness or out of loneliness, it still proved to be such an effective sexual strategy that we lost the bone to our boners.[4]
Effect
Because humans lost their Penis Bone, they needed to evolve a better system. This system was to make human schlongs bigger than most other great apes.
Humans have a much longer and wider penis than the other great apes. Even the largest of gorillas, more than twice as heavy as a human, will have a penis just two and half inches long when erect.[5]
Cautions
Even though human males long ago lost the Penis Bone, it is still possible to "fracture" the penis.
A study published in the journal of Advances in Urology investigated which sex position caused the most damage to a man’s penis. After considering 44 cases of penile damage, researchers concluded that the heterosexual position of “woman on top” was “potentially the riskiest sex position,” as it caused the most penile fractures.
Penile fracture is a relatively uncommon clinical condition that frequently causes fear and embarrassment for the patient, hypothetically resulting in delayed search for medical assistance, which can lead to an impairment of sexual and voiding functions.[6]
Further Reading
- If you want your own penis bone, you can buy them on amazon.
- 5 bucks for a coyote penis bone
- Penis bones shed light on sex life of ancient, extinct bears
- Penis Facts
- What Otters' Penis Shrinkage Could Mean for Humans
- It could have been a "sperm scoop"
- Innovative 3D scanning and modelling helps solve mystery of mammal penis bones
- We Might Finally Know Why Humans Lost Their Penis Bones
- We Have Finally Discovered Why Boners Don’t Have Actual Bones in Them
- Why does it seem like all these articles are written by women?
References
- ↑ It is worth noting that hunter-gathers around the world practice only monogamy or serial-monogamy which suggests that our ancestors may have used this mating system.
- ↑ https://www.theguardian.com/science/2016/dec/14/why-dont-humans-have-a-penis-bone-scientists-may-now-know-baculum
- ↑ Three main theories have been put forward. First is the need for long-term parental care and teaching, as our children take a long time to mature. Second, males need to guard their female from other males. Third, our children are vulnerable for a long time and infanticide could be a risk from other males. So to ensure that children are able to reach maturity the male is likely to stay to protect them, both socially and physically. This may be why males have maintained their larger relative size.
- ↑ Human monogamy has long puzzled anthropologists, and lots of effort has gone in to working out what keeps males hanging around.
- ↑ https://theconversation.com/why-did-humans-evolve-big-penises-but-small-testicles-71652
- ↑ https://www.hindawi.com/journals/au/2014/768158/
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