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" We have seen how women, biologically distinguished from men, are culturally distinguished from “human.” Nature produced the fundamental inequality — half the human race must bear and rear the children of all of them — which was later consolidated, institutionalized, in the interests of men. Reproduction of the species cost women dearly, not only emotionally, psychologically, culturally but even in strictly material (physical) terms: before recent methods of contraception, continuous childbirth led to constant “female trouble,” early aging, and death. Women were slaves class that maintained the species in order to free the other half for the business of the world — admittedly often its drudge aspects, but certainly all its creative aspects as well. "
― Shulamith Firestone , The Dialectic of Sex: The Case for Feminist Revolution