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 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.

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, humans began to move towards monogamy. Single mates, as a strategy, prevents some other potential mate from getting sloppy seconds.

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. 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.