This chapter draws from theatrical, anthropological, and philosophical discourses, but mainly phenomenology, to show that what is called gender identity is a performative accomplishment compelled by social sanction and taboo. Feminist theory has often been critical of naturalistic explanations of sex and sexuality that assume that the meaning of women’s social existence can be derived from some fact of their physiology. For both Beauvoir and Merleau-Ponty, the body is understood to be an active process of embodying certain cultural and historical possibilities, a complicated process of appropriation, which any phenomenological theory of constitution needs to describe. In order to describe the gendered body, a phenomenological theory of constitution requires an expansion of the conventional view of acts to mean both that which constitutes meaning and through which meaning is performed or enacted. The feminist appropriation of the phenomenological theory of constitution might employ the notion of an act in a richly ambiguous sense.