From Thomas More onwards, writers of utopias have constructed alternative models of society as a way of commenting critically on existing social orders. In the utopian alternative, the sex-gender system of the contemporary society may be either reproduced or radically re-organised. Reading utopian writing as a dialogue between reality and possibility, this study examines the relationship between historical sex-gender systems and those envisioned by utopian texts. Surveying a broad range of utopian writing from the nineteenth and twentieth centuries, including Huxley, Zamyatin, Wedekind, Hauptmann, and Charlotte Perkins Gilman, this book reveals the variety and complexity of approaches to re-arranging gender, and locates these 're-arrangements' within contemporary debates on sex and reproduction, masculinity and femininity, desire, taboo and family structure. These issues occupy a position of central importance in the dialogue between utopian imagination and anti-utopian thought which culminates in the great dystopias of the twentieth century and the postmodern re-invention of utopia.