I'd wanted to see this movie for years, and finally got around to it, on DVD. What a treat! I was glad to discover that the erotic element, though important, is not the predominant draw here; typically, some references to the film make it sound as though it were some forbidden erotic romp, or full of perverse sexuality. Instead I found myself wrapped up in a creepy suspense-thriller sci-fi-fantasy carried off with wit, style, and extraordinarily interesting photography (including one scene that, at least on my set, was completely black for a couple of minutes).
I voted "nine" for this wonderful film, in part because it left me with a lot to think about, in part just for how well it was made. The music by Toru Takemitsu is absolutely perfect for the task, too.
This is just about my favorite kind of film: one that raises important questions about human life, but not at the expense of entertainment. It's as close as I'll probably ever come to having my cake and eating it, too.
Update, January 2007: I finally obtained my own DVD of this film, one with much higher quality photographic reproduction. I now marvel even more at the extraordinarily creative photography. Be sure, if you view this on DVD, not to boost your set's brightness: I can assure you the film is very, very dark on purpose. If possible, see it on a high-definition monitor. Today, I'd vote "ten."