nature of sexuality and morality. The opening portion introduces the book's intent to conduct a comprehensive examination of the Marquis de Sade's life, works, and their significance within the broader historical framework of the 18th century. The author proposes a scientific exploration of Sade's contributions and the societal factors that influenced his controversial ideas. It sets the stage for detailed discussions on Sade’s individual psychology and the social psyche of his era, emphasizing the importance of understanding the broader cultural context to grasp Sade's impact on both literature and the social debates surrounding morality and sexuality during the Enlightenment. (This is an automatically generated summary.)