Traditional Christian descriptions of homosexuality as a “sin against nature” rely on a claim about the transparency of the sexed body to universal reason: homosexual acts are sins against nature because natural law renders them obviously unnatural. This moral description “unnatural” subverts itself for two reasons. First, neo-traditionalist descriptions conflate “natural” and “normal.” Dialogue with Didier Eribon's work on the “insult” shows how such moral descriptions self-subvert and render chastity impossible. Second, neo-traditionalists use the description to require celibacy, which the (...) tradition teaches is likely impossible without a special gift. This use of natural law thus fails to be self-consistent or true to reality and so undermines its ability to serve as a critical principle in the search for truth. A critical use of natural law allows for an alternative, non-insulting description of homosexual characters. This essay outlines the character description through immanent critique of two spheres of Catholic teachings about sex: Augustinian sexual ethics and nuptial theology. (shrink)