This is a densely written but repeatedly rewarding study of the constructions of gender and sex as they relate to women, lesbians and gay men, and, to follow the logic of Butler's argument, all of us. This work 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. The book's one flaw is a turgid, sometimes redundant prose (i.e. phrases like "judical law" and "'he' [sic]") all too common in technical and philosophical writing, especially, alas, of the postmodernist variety. But once the reader survives the first quarter of the book, he [sic] will find Butler's observations not only accessible but fascinating and, for whatever it's worth, socially important.