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In this sense, gender is not a noun, but neither is it a set of free-floating attributes, for we have seen that the substantive effect of gender is performatively produced and compelled by the regulatory practices of gender coherence. Hence, within the inherited discourse of the metaphysics of substance, gender proves to be performative—that is, constituting the identity it is purported to be. In this sense, gender is always a doing, though not a doing by a subject who might be said to preexist the deed. The challenge for rethinking gender categories outside of the metaphysics of substance will have to consider the relevance of Nietzsche’s claim in On the Genealogy of Morals that “there is no ‘being’ behind doing, effecting, becoming; ‘the doer’ is merely a fiction added to the deed—the deed is everything.” In an application that Nietzsche himself would not have anticipated or condoned, we might state as a corollary: There is no gender identity behind the expressions of gender; that identity is performatively constituted by the very “expressions” that are said to be its results.
— Judith Butler | Gender Trouble.