Sex, love, and friendship play an integral role in Immanuel Kant's conception of human life. Against common prejudices, Kant provides substantial contributions to the philosophical discussion of these topics. This unique collection of essays sheds light on how the notions function in Kant's philosophy, both individually and in conjunction with each other. The essays examine intertwined issues such as theory of sexuality, marriage (including same-sex marriage), morality and sexual objectification, love and autonomy, love of human beings, the conceptual structure of love, friendship, misanthropy, and the highest good. The contributors include internationally well-known experts in the field. They approach the topics diversely from historical, philosophical, critical, and interpretative perspectives. The collection will be an invaluable resource for Kant scholars and for anyone interested in affective social relations in the history of philosophy and beyond.