While American public schools may be famously underfunded, the lack of cash flow going into our education system can be summed up by one fact — just how little everyone, especially men, know about women's bodies. Case in point? All these dudes who proved they have no idea what they're talking about when it comes to womens' experiences with periods, pleasure and simply existing in the world. 

From period's monthly schedule to the fact that no, women are not turned on by mass shootings, here are 24 dudes who didn't know the difference between a vulva and a Volvo.