The 'natural' is not necessarily a 'human' value. Humanity has begun to transcend nature: we can no longer justify the maintenance of a discriminatory sex class system on grounds of its origins in nature. Indeed, for pragmatic reasons alone it is beginning to look as if we must get rid of it.
Shulamith FirestoneJust as the end goal of socialist revolution was not only the elimination of the economic class privilege but of the economic class distinction itself, so the end goal of feminist revolution must be, ... not just the elimination of the male privilege, but of the sex distinction itself; genital differences between human beings would no longer matter culturally.
Shulamith FirestoneMen are thinking, writing, and creating, because women were pouring their energy into those men; women are not creating culture because they are occupied with love.
Shulamith Firestone