Abstract: Civil and Natural Laws are at the heart of Enlightenments’ thought. Incest constitutes a problematic point: to what domain does it belong? This question is answered by philosophes such as Montesquieu, Voltaire or Diderot, by authors such as Prévost or Sade and the replies are so different. This paper focuses on Diderot’s. This “taboo” (not called so yet) acts like an epistemological revelator.
