One of the main axis of female oppression is reproduction. Glosswitch expounds on this theme, I recommend viewing the entire post here.
“The trouble with reproductive choice isn’t that most of us are in mourning over embryos gone to waste. It’s that, if you really believe in it, you have to give people with uteruses the final say in who gets to be born, 100% of the time. That’s quite a big deal; men know it’s a big deal. After all, it means admitting that some people with uteruses can do something that no one with a penis ever can. Patriarchy, in seeking to establish paternity as the central social relationship, cannot allow for this. Instead we are meant to think that babies develop not with the help of the flesh and blood of the person who gestates them, but solely from men’s seed or, in our more progressive age, partly of his seed, partly of hers. As Barbara Katz Rothman points out, in such a system “children […] might as well have grown in the backyard.” So why not treat women as mere potting soil?”