An interesting thing about Salo is that it seems to be a very mild adaptation of Marquis De Sade's 120 Days of Sodom .. I haven't read it (nor would I), but at least it seems that way after checking out the plot synopsis of the
depraved work on Wikipedia.
I don't understand why anyone would write a story about rich "libertines" torturing and sexually molesting children for months before finally killing them, including their own daughters. And it's from 1785.
I guess Marquis de Sade was a real *******