To be honest 99% of times I read how men freak up about this, perfectly natural thing, is when women tell stories about how men freak out when some one as much as talks about period. Actually under almost each FML in this site, even remotely connected to menstruation you can find few women talking about how we are terrified of it, and replies from men usually are "chill its no big deal". Maybe you can explain this phenomena to me? Like did you pull this statement out of your ass? Or some dude who thinks that being virgin till 30 will make him a wizard, once freaked out when you was talking about periods, and you became convinced, that men do not understand biology and think that women fart butterflies?

Try a college biology class, with 15 of the 20 guys in it making disgusted statements about how they "don't need to know this shit." Ages ranging from sixteen to twenty-seven, and the under-eighteens being the ones calm about it.

So you are conflating 2 different things into one. First if I remember well men also giggle and make stupid remarks, when there is penis or something remotely sexual in biology. Second, even though knowing details might be useful sometime in their lives, but other than that, unless they are studying medicine, they really don't need to know everything. Just like you do not get freaked out by the fact that people shit, but you don't really want to know details about size, hardness and splatter radius. So the question would be how many times did you see men freak out about it, when some "accident" actually happens, not when bunch of guys try to impress each other by being shitty trolls? BTW by freak out i don't mean "I don't really want/need to hear what kind of period you had/have".