The perenniality of the sexes and the perenniality of slaves and masters proceed from the same belief, and, as there are no slaves without masters, there are no women without men. The ideology of sexual difference functions as censorship in our culture by masking, on the ground of nature, the social opposition between men and women. Masculine/feminine, male/female are the categories that serve to conceal the fact that social differences always belong to an economic, political, ideological order. Every system of domination establishes divisions at the material and economic level. Furthermore, the divisions are abstracted and turned into concepts by the masters, and later on by the slaves when they rebel and start to struggle. The masters explain and justify the established divisions as a result of natural differences. The slaves, when they rebel and start to struggle, read social oppositions into the so-called natural differences.