The science of “morning wood”

The Sex-Ed class you never got in school!

Why do men tend to wake up with “morning wood”? AsapSCIENCE looks at the hard facts and some of the biology of an erection, to discover the mechanism behind this phenomenon.

I’ve always been a curious guy. I love the AsapSCIENCE guys for these quick explanations about things I’ve wondered about. Follow them on YouTube.