This book provides a comprehensive account of sex, love, and gender—the first of its kind—by engaging a seemingly unlikely ally: Immanuel Kant. To date, no scholar has considered Kant’s potential contributions to such an account; nor is this surprising. Kant explicitly views sexual activity as inherently morally problematic, maintaining as ethically permissible only heterosexual procreative sexual activity within the confines of legal marriage. Kant’s comments on sex, love, and gender are also diffused throughout his practical works—from his works on ethics and legal-political thought, to his works on aesthetics, teleology, history, religion, and anthropology—presenting a textual and philosophical obstacle to reconciling his accounts of human nature and of human rights and freedom into an integrated whole. Sex, Love, and Gender—A Kantian Theory takes on these challenges. It offers an innovative interpretation of Kant’s account of sex, love, and gender, which shows how his disparate references can be seen as parts of one coherent philosophical approach. The book also rehabilitates Kant’s theory by overcoming the philosophical mistakes and limitations of Kant’s own writings. The result is a philosophical understanding of the phenomenology of sex, love, and gender and core related moral (ethical and legal) issues such as sexual orientation, abortion, sexual or gender identity, marriage, erotica, sexual oppression, and trade in sexual services.