These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nausea Fuel: Copious amounts of it. The 120 Days of Sodom is the most notorious in this regard, but almost all of Sade's works have content that can easily turn a reader's stomach.
Nightmare Fuel: The 120 Days of Sodom: At first it's just Nausea Fuel. Then you get to the gorn. Which includes rape, torture, sodomy, and killing of innocents in most brutal ways. What's worse, it was made into one of the most challenged films of all time, similar in notoriety to Cannibal Holocaust and Men Behind the Sun.