Have you ever heard a man say that he “just don’t understand women” before? It’s likely that you have. I mean, there have been whole books written on the subject of how different we are.

Even though we’ve heard all about it before, it has recently become apparent just how much men really don’t understand, until, of course, they start living with one. We aren’t talking about the stuff they can learn from mommy, either. Oh no, this is the real low-down on women that she would never dare to give you.

Men on Reddit were asked to answer the question, “What did you not know or realize until after living with a woman?” and some of the answers are hysterical.

Some of these guys had been raised by single mothers or had sisters but, obviously, living with a female partner adds a whole new dimension to the learning experience. Here are 56 of their best responses.