This paper provides a cross-cultural account of gender diversity which explores the territory that is opened up when sex, gender, and sexual orientation, binaries are disrupted or displaced. Whilst many people who identify as trans or intersex see themselves as male or female, others identify in ways which destabilize sex/gender and sexual orientation binaries. The paper provides a typology of ways in which sex/gender diversity can be conceptualized, and draws out the implications for theorizing gender. It discusses the contributions made by the new wave of authors working in the field of transgender studies; authors who draw on and inform the sociology of sex and gender, feminisms, and poststructuralist theory. It based on empirical material from research carried out in India and the UK.