the center of the film about morals (I think) can be seen from several places, one, Madeleine said after being flogged that if I don't bring myself into being a prostitute or a prisoner in the reading, I can't Be a good girl in reality; second, Madeleine is still a virgin after her death (even though the marquis has a huge desire for her and did not violate this woman); third, the crazy priest at the end of the film begins to write the story of the quill , outside the picture is the voice of the Marquis, saying that we must fully understand our own vices in order to understand the essence of human nature.
Because there are both good and evil in human nature, Marquis's writing and Madeleine's reading are just different forms of catharsis, so that they can face their souls more truthfully.
So I think it's about freedom, you understand your own despicable evil thoughts and desires after fully dissecting and interpreting yourself in a certain way, so that you can truly face your true self. It is a certain degree of freedom to use the true self likes and dislikes clearly or can not but say. As a negative doctor, he strictly abides by the externally imposed code of conduct, but releases evil desires in the dark. It's abominable and even more pathetic.
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