"Philosophy in the Boudoir" (French: "La philosophie dans le boudoir") is a controversial book written in 1795 by the Marquis de Sade, presented as a dramatic dialogue. Initially viewed as pornography, the work has since been recognized as a socio-political drama. Set in a boudoir, the story centers around two main characters who argue that libertinism is the only moral system that can support the recent political revolution in France. They believe that if the French people don't embrace libertine philosophy, the country will revert to a monarchic state. Throughout the dialogue, Sade advocates embracing atheism, rejecting societal beliefs about pleasure and pain, and justifying any crime committed in the pursuit of pleasure. The book delves into explicit sexual content and explores libertine philosophies, bisexuality, incest, and sodomy. The protagonist, Eugénie, is corrupted by Madame de Saint-Ange and Dolmancé, acting on the request of her father to strip her of moral values. The story ends with Eugénie's mother attempting to rescue her daughter, but she becomes a victim of the libertine characters' brutality instead. "Philosophy in the Boudoir" is divided into seven dialogues, and Sade includes a section advocating for the abolition of religion after the French Revolution. The book is a daring exploration of taboo subjects and the pursuit of pleasure above all moral constraints.