I first heard about the film in high school when a film buff who was a bit older than me watched it and said he could barely hold his dinner in by the end, but I watched it in my 30s and didn't feel anything like that, and was (stupidly) disappointed. People shouldn't watch the film just to see if it's as gross as they've been told--you've got 2 Girls 1 Cup for that these days, not some film made by a gay Marxist Italian intellectual.
Or hey, you could just go look up the pics of Pasolini after he was murdered, he was murdered pretty gruesomely, and not long after he did Salo, either.
I am not going to watch A Serbian Film, but I sincerely doubt it has an intellectual subtext the way Salo does.
Don't Look Now - Julie Christie and Donald Sutherland do a sex scene and both are in the buff and it looks pretty close to real, so I could see how people have been fooled, but they still didn't. I've always sort of wondered how actors feel about doing stuff like that.
It's a horror movie about a guy who loses his daughter, then doesn't realize he's psychic.