'Lesbian and gay rights are human rights!' Is this just a political slogan to be chanted outside legislatures? Or are there legal arguments to support the claim that the right to be free from sexual orientation discrimination is a human right? In particular, can national constitutions and international human rights treaties be interpreted as prohibiting discrimination against same-sex activity, gay, lesbian and bisexual individuals, and same-sex couples? Robert Wintemute attempts to answer these questions by examining three of the most commonly used arguments in favour of such an interpretation: sexual orientation is an 'immutable status', sexual orientation is a 'fundamental choice' or part of 'privacy', and sexual orientation discrimination is sex discrimination. To assess the merits of these arguments, he looks at their relative success and failure in cases argued under three of the world's most influential human rights instruments: the United States Constitution, the European Convention on Human Rights, and the Canadian Charter of Rights and Freedoms. He also considers the potential impact of the United Nations Human Rights Committee's recent interpretation of the International Covenant on Civil and Political Rights in Toonen v. Australia.