 The term ‘homosexuality’ was coined in the late 19th century by an Austrian-born Hungarian psychologist, Karoly Maria Benkert. Although the term is new, discussions about sexuality in general, and same-sex attraction in particular, have occasioned philosophical discussion ranging from Plato’s Symposium to contemporary queer theory. Since the history of cultural understandings of same-sex attraction is relevant to the philosophical issues raised by those understandings, it is necessary to review briefly some of the social history of homosexuality. Arising out of this history, at least in the West, is the idea of natural law and some interpretations of that law as forbidding homosexual sex. References to natural law still play an important role in contemporary debates about homosexuality in religion, politics, and even courtrooms. Finally, perhaps the most significant recent social change involving homosexuality is the emergence of the gay liberation movement in the West. In philosophical circles this movement is, in part, represented through a rather diverse group of thinkers who are grouped under the label of queer theory. A central issue raised by queer theory, which will be discussed below, is whether homosexuality, and hence also heterosexuality and bisexuality, is socially constructed or purely driven by biological forces.