Women's menstrual cycles are functional evolutionary adaptations that optimize their bodies for two distinct roles: attracting mates in the first half and preparing for potential pregnancy in the seco

“The whole purpose of having a cycle in the first place is reproduction. And for a male to reproduce, all you have to do is one thing, right? And that one thing is have sex. Uh, and for a female, it's a little bit more complicated that than that because we're mammals.”