Taylor is amazing in this! Quite true to Muriel Spark's remarkable novella right down to the dialogue, and plays with the narrative in a similar way. Storaro's cinematography and giallo aesthetics are beautiful - I saw it described as "the cinematic equivalent of viewing a scorpion trapped in amber". That said, it underreads the story as a 'search for the ultimate orgasm', and the film is less subversive for it.
I don't like how the plot description calls this so-bad-it's-good. There are moments of enjoyment for likely unintentional scenes, and it IS an 'art' film in all possible grievances of that term... but I wouldn't call it bad. Just super screwed up. If it were a friend it'd be that person you've thought of as odd but nevertheless wished to see again because of their aura. Liz Taylor ftw.