Les bijoux indiscrets
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Les bijoux indiscrets (English title: The Indiscreet Jewels) was Denis Diderot's first novel, published anonymously in 1748. It is an allegory that portrays Louis XV as the sultan Mangogul of the Congo who owns a magic ring that makes women's genitals ("jewels") talk.
A comparable trope that Diderot must have known is found in the ribald fabliau Le Chevalier Qui Fist parler les Cons.