This course introduces scholarly debates about sexual identities, gender identities and expressions, and sexual orientation and its representation in film and literature. We begin with a contemporary debate about biology and gender identity, considering its relationship to the historical understanding of sex, gender, and sexual identity. Our investigation continues with the theoretical underpinnings of the emerging field of queer studies, from the nineteenth century to the present day, and considers how subsequent work in transgender studies continues to challenge traditional understandings of sex, gender, and sexuality.