Reproductive System, Part 3 - Sex & Fertilization: Crash Course Anatomy & Physiology #42

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how fertilization happens, and how different contraceptive methods work.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Chapters:
Introduction 00:00
Four Phases of Human Sexual Response Cycles 0:53
Fertilization 3:01
Contraceptive Methods 6:59
Review 8:58
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Mark, Eric Kitchen, Jessica Wode, Jeffrey Thompson, Steve Marshall, Moritz Schmidt, Robert Kunz, Tim Curwick, Jason A Saslow, SR Foxley, Elliot Beter, Jacob Ash, Christian, Jan Schmid, Jirat, Christy Huddleston, Daniel Baulig, Chris Peters, Anna-Ester Volozh, Ian Dundore, Caleb Weeks

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[crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

[SuneOli]

It's actually pretty amazing how much can go wrong before an egg is even fertilized, and yet here we all are!

[Starlight]

we're gonna keep as sfw as possible *inserts loud sex noises*

[starling]

"We'll do this as SFW as possible."
1 minute in: "*very suggestively moving people*"

[Lewlsquish]

You’re telling me that I wasn’t the sperm that won the race? I merely entered because the fastest sperms broke down the walls for me to get in? No wonder why I’m a failure

[LynneSkysong]

I love CrashCourse's take on explaining sex. If only this was around when I was in school. Oh well, it is now! My one constructive criticism is that I would have liked to see a plug for Sexplanations in the beginning when Hank talked about all the things they WOULDN'T be taking about. Other than that, excellent job!

[thomasgabby]

I bet the animators couldn't keep a straight face when making the video assets or animating them.

[rynsawyer]

I had no idea fertilization was so complicated. This is actually quite interesting once you get past the awkwardness.

[yaqarianfanashira]

"the sex" *saxophone music * 😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂

[MSadamgasm]

i have already learnt all this 2 years ago, but idk, its just really amusing to watch Hank talk about The Sex XD

[procrastinator]

OH GOD, THAT FLIGHT OF THE VALKEIRIE!!! LMAO!! Trying to be mature and absorb the information, but holy that was hilarious.

[sarahwells]

It'd be awesome if CC could do a video on how the different types of twins are formed as well as how chimeras happen. :D

[jaredjones]

6:33 lol I love the 3 sperm sitting right outside the egg, like they're jealously thinking: "Damnit, that should be US in there!!!!" 😂

[FiniteAtticus]

LOL @ 3:59 Flight of the Valkyries should have been played through the whole video, that would have been hilarious! ...though people probably would have taken it less seriously.

[allenpeppers]

He may talk fast but he keeps your attention!

[K.S.Khunkhao]

Very informative. Reminds me of the miracle of life. Thanks Hank and CC!

[anusha]

Ahahaha, the music at 4:06, love this series, definitely helping me prepare for the exam! Thanks!

[fishysmom]

sadly this gave me more information in ten minutes then my health class in 8th grade did in four weeks... It also made more sense as well

[alannahhurley]

Gosh! I really need to give sperm cells more credit. Sure the female reproductive system does most of the work but the sperm cells do have to woe the heart of a egg (metaphorically speaking) and that's almost as hard as wooing the woman.

[exceldivine]

Idea for a birthday cake: Congratulations on winning the race!