No, women don't have fewer ribs than men, and men don't have one extra bone, if you

know what I mean.

You know what I mean.

But several mammals, including our close relatives like chimpanzees, do have that extra bone,

so today let's talk about why other animals have penis bones while humans got the shaft.

It wasn't always this way.

Researchers who traced its evolutionary timeline found the penis bone, also known by its scientific

and less fun name the baculum, first evolved around 145 million years ago after placental

and non-placental mammals split.

This means that way back, our ancestors had a baculum, and on the way to being human they

lost it.

The researchers put that about 1.9 million years ago.

Ironically, in the time of Homo erectus.

The reason why we lost our baculum may be down to our mating strategy.

Baculum length in primates is closely correlated with intromission time, which is how long

the penis is inside the vagina.

If a primate is going to spend a longer time doing their monkey business, it helps to prop

up their banana.

What constitutes a long intromission?

According to the researchers, 3 minutes, and humans don't quite make the cut.

Our average time from penetration to ejaculation is less than two minutes, so it looks like

we just don't need the extra support.

There are primates like bonobos who copulate for 15 seconds at a time, and yet they still

have a baculum.

This might be because they're polygamous primates, where many males mate with many

females, meaning competition is stiff so they have to be too.

In other polygamous species, having a bone in their boner will help keep them copulating

longer, so other males don't get a chance with their lady.

They are, quite literally, cock blocking.

By comparison humans face less competition for mates because of our monogamous mating

strategy.

And that along with short intromission times may be why our baculum was lost to history.

You may think we got stiffed, but I have some news that'll pick you up.

Penis bones come in all shapes and sizes, and while some of them are impressive and

slightly terrifying, like the 2 foot baculum of the walrus, plenty of them aren't.

Chimps, for example, have a baculum about the size of your fingernail.

In fact even without the extra skeletal bone, humans still have the biggest penises of the

great apes.

So, you know what, I don't miss it.

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For more on that crazy walrus baculum watch Carin talk about it on Wild Sex, here.

Make sure you subscribe for more videos and remember…

Gorillas, with all their chest-thumping, only have a 2.5 inch penis.

Showing yet again, that we are all compensating for something.

Thanks for watching and I'll see you next time on Seeker.