Butler investigates the theoretical roots of an ontology of gender identity to show their political parameters. She questions traditional and feminist sex/gender distinctions, arguing that the basic concepts in this discourse are themselves produced by relations of power. The result is a subversive work drawing on Foucault, Lacan, Sartre, etc. It shows not only the relativity of our cultural understanding of femininity but also the limits of our scientific understanding of female-ness. For feminists, Butler's book offers a much-needed examination of what exactly the female subject is and how woman is defined in (or by) our particular culture. Butler goes far beyond Foucault in examining sexuality as socially contructed and, in the process, offers valuable insights to (and critiques of) the writing and thinking of Beauvoir, Kristeva, Lacan, and Wittig.