Here's the largely post-structuralist literary critic Mary Poovey on the definition of "woman" in cultural terms:
The epistemological term woman could guarantee men’s identity only if difference were fixed – only if, that is, the binary opposition between the sexes was more important than any other kinds of difference that real women might experience. And this depended, among other things, on limiting women’s right to define or describe themselves. […] women were granted the authority to write and publish literature, but they were largely denied access to ‘masculine’ discourses like medicine, law, and theology.
From her book Uneven Developments about women & writing in the 19th Century. I know post-structuralist thinkers - and the dreaded "Queer Theory" - are often held up as muddying the radical feminist waters, and making current 20 year olds think that they are justified in their sometimes muddled arguments.
But I think here Poovey is pointing out something that's still happening: control of certain discourses is used by men to control women.