What rights govern heterosexual and homosexual behaviours? In this volume two philosophers debate this important issue. Laurence Thomas analyzes and criticizes heterosexual privilege, and questions the very foundations upon which we construct identities tied to sexual orientation and gender. He argues that discrimination or any hierarchical power relationships based on sexual orientation are unjustified, and asserts the rights of lesbians and gay men to participate equally in such social institutions as marriage and military service. Michael Levin defends the unorthodox view that the aversion some people experience toward homosexuality deserves respect. He further argues that while homosexuals enjoy the same rights as others to be free of violence and discrimination, they do not have more extensive rights.