Here are the facts about periods: it happens once a month to goddesses everywhere, it lasts three to five days, and it occasionally attracts carnivorous reptiles who climb up from the toilet. These are some of the things y'all men can learn from this CollegeHumor video written by comedian Siobhan Thompson (she's the one holding the blood buckets). Hashtag GET OVER IT, fellas!

Sources: College Humor