My mom was a nut in many ways but I always knew that she loved me. One way she showed her love was by setting aside the time, when I was about nine years old, to tell me what a woman's period was all about. It was just her and me in the house, I don't remember where everyone else went, what happened before or what happened after. What I do remember is sitting on the nubby couch in the living room as she drew a rough sketch of the the female reproductive system. It looked like the head of a cow with horns.
I was lucky. Thanks to my Mom's example, I was able to provide the same to my own daughter. Sadly, I know a lot of women who didn't get the "wondrous mystery of becoming a woman" explained to them in any manner whatsoever or, worse, in a way that was traumatizing. Maybe they just started bleeding "down there" one day, and someone, usually their mom, threw them the necessary sanitary device and that was that. The underlying message was, "It's shameful and dirty, therefore you are shameful and dirty. Deal with it."