To begin on your non-SIoSI point, I will try almost any form of offensive or transgressive cinema. Is there really an extended 180 Days of Sodom, or I think you mean Salo, 120 Days of Sodom. For most viewers, four months of that cruel story would more than suffice!
Now, about that Star Wars franchise. I should not rewatch Episode 7 before watching Episode 8. That is because I saw the original Star Wars in college, and… wait for it, wait for it... have never seen any of the sequels or prequels.
I admire the craftsmanship and many of the actors – Carrie Fisher and Sir Alec Guinness, RIP; Natalie Portman, Ewan MacGregor, et al -- but I prefer sci-fi in the creepy chills and thrills department. I would have enjoyed a sequel, for example, to Event Horizon, and gladly watched the original in preparation.
Now, SIoSI have my best friend over, and show him A Serbian Film without any content warning? (I suppose this is best answered by someone who has seen it – or walked out in revulsion, as many have. Or at least, you have researched it and said, :crazy2: )