In “A Treatise on the Crime of Onan,” S. A. D. Tissot presents a compelling exploration of the moral, theological, and psychological dimensions surrounding the biblical figure Onan and his actions. Through a meticulous analysis of biblical texts and historical interpretations, Tissot employs a scholarly tone enriched with philosophical inquiry and critical thought. The treatise situates itself within the broader discourse of 18th-century European Enlightenment, where reason challenged traditional dogmas, and addresses the implications of Onan's story on contemporary ethics, sexuality, and societal norms. S. A. D. Tissot, a prominent figure in medical and ethical discourse of his time, utilized his background in both medicine and theology to address the complexities of human behavior and morality. His institutional affiliations and personal experiences likely contributed to his interest in sexuality and its ramifications in society, leading to this incisive examination. Tissot's work reflects a synthesis of Enlightenment rationalism and religious tradition, offering a nuanced perspective on issues of sin, society, and self-regulation. For readers interested in the intersection of theology, morality, and history, Tissot's treatise stands as an essential text. Its scholarly rigor and relevance to ongoing debates about sexuality and ethics make it an invaluable resource for theologians, historians, and anyone seeking to understand the cultural implications of biblical narratives. This work is not only a historical inquiry but also a provocative challenge to reconsider the foundations of modern ethical perspectives.