Many philosophers—Kantians or not—consider formulating an applied theory of sex, love, and gender to be an undertaking that is neither particularly difficult nor particularly important. In addition, that there has not yet been a comprehensive Kantian philosophical account of sex, love, and gender is perhaps not terribly surprising. After all, Kant views sexual activity as inherently morally problematic, and ethically permissible only as heterosexual procreative sexual activity within the legal confines of marriage. And in presenting these views, he makes many sexist and heterosexist assertions. For non-Kantian scholars working within feminist philosophy or the philosophy of sex and love, Kant’s philosophy consequently has not stood out as a particularly interesting or useful resource for understanding human diversity when it comes to sex, love, and gender. Also, Kant’s statements about sex, love, and gender are dispersed throughout his practical and aesthetic-teleological works. For a long time, no Kant (or any other) scholar found it philosophically worthwhile to engage these aspects of Kant’s writings, let alone to take up the somewhat daunting task of gathering together and theorizing as a whole Kant’s complex, yet not explicitly spelled-out, ideas on sex, love, and gender before reconstructing a philosophically more persuasive theory....