Humans may think we have the market cornered on bizarre sexual acts, but the animal kingdom has come up with some mating rituals that put us to shame. <b<br/>r/>

Hosted by: Hank Green

Sex can be a taboo conversation, but over the years we found out that our viewers had a lot of questions about it. So we’ve put some of the answers to those questions into one video!

Genitals are the fastest-evolving organs in the animal kingdom. But why is this so? And what's the point of having decorative private parts? Menno Schilthuizen explains how the evolutionary biology of nature's nether regions uncovers a...

Female hyenas don't have penises, but it sure looks like they do - and we still aren't quite sure why.

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Because there are so many different types of penises among our evolutionary relatives, we didn’t know until a recent discovery whether they all had the same origin.

Most other mammals have penis bones, so why don't we?

Why did so many birds ditch penises? Maybe it was natural or sexual selection, an accident, or in exchange for something way more useful to them. Whatever the reason, penis loss goes to show that internal fertilization doesn’t require a...

Think you know a thing or two about sex? Think again. In this fascinating talk, biologist Carin Bondar lays out the surprising science behind how animals get it on. (This talk describes explicit and aggressive sexual content.)

In this collection of classic MinuteEarth videos, we take a look at how deep the divide between males and females actually goes.

Our month-long exploration of human reproduction continues with a look at testicular anatomy, the steps of sperm production, and how it's influenced by gonadotropin and testosterone. Hank also explains how sperm mature, and how...

Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work?

Male birds have the largest genital diversity of any class of animals because their sex chromosomes make it easy to pass male-helping mutations down the...

"Bonk" author Mary Roach delves into obscure scientific research, some of it centuries old, to make 10 surprising claims about sexual climax, ranging from the bizarre to the hilarious. (This talk is aimed at adults. Viewer discretion...

Are penises as big of a deal as we think they are? In this episode of Crash Course Sex Ed, we break down the history, myths, and assumptions we’ve made about penises, from the “right” size to circumcision, and from erections to blue balls.

Do you know the difference between the vulva and vagina? In this episode of Crash Course Sex Ed, we shine a spotlight on the Vagina and Co., dispelling a long history of shame and mystery to actually understand our bodies.

What even is sex? In this episode of Crash Course Sex Ed, we’ll discover that variation is the name of the game when it comes to sexuality. People differ in how they have sex, why they have sex, and how they define what sex means.

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