Here are some facts men don’t know about periods

Periods are a total mystery for men. It's hard for them to understand how it works and they just find it disgusting.

So girls from College Humor made this (hilarious) video to explain to men how their periods work.

Like ho much blood will flo during THAT time of the month:

How periods can be dangerous for women:

And why above all why do they blood one a month:

Watch more in the full video: