 Singular personal pronoun usage, Frye argues, is impossible without knowing the sex of the person one is discussing, and in many cases sex would otherwise be utterly irrelevant. Frye takes this to be an instance of a general tendency to make sex relevant where it need not be, which she takes to be a key feature of sexism. In addition, she suggests, the constant need to know and indicate sex helps to perpetuate the conviction that sex is a tremendously important matter in all areas. For Frye, this is a key factor in perpetuating male dominance: male dominance requires the belief that men and women are importantly different from each other, so anything that contributes to the impression that sex differences are important is therefore a contributor to male dominance.