Orgasmo

While watching this well-paced film in Italian with subtitles (1 hour 33 minutes), I thought more than once, "It's keeping my attention, but unless it's got a strong ending, the whole thing's going to seem pretty pointless." Fortunately, the last five minutes or so are excellent, with at least three twists, two of which I didn't see coming. (I did, very late, guess the third twist, because I'd seen the ending of a certain mid-'70s Peter Fonda movie.)

I also watched part of the American version, which, although 2 minutes shorter, seemed to have significantly more nudity (and actually began with a "This picture has been rated X" card). Of course, today, it would be, at most, a very mild R.