It comes from hatred. The parts of our bodies that make us unique and beautiful can't be duplicated. We are blessed with the ability to create a life inside our wombs. The wanting to be something you can never be can cause a seething hatred born of jealousy. The goal is to try and paint our bodies as vulgar and dirty in an attempt to degrade and humiliate us. I suspect it doesn't really make them feel any better about themselves. They can only hope their vulgarity makes us ashamed of what we are. Unfortunately for them, they don't have that kind of power. I love being a woman and nothing a wannabe can say will change that.