This review may contain spoilers. I can handle the truth.
One of the very few movies where you are kind of happy that it looses some of it's intensity in the second half, at least temporarily.
So, after rewatching it (and vaguely remembering some parts of "Pervert's guide to cinema") I'll try my shaky explanation of what's going on in this film:
So yes, the sax guy (Bill Pullman) did kill his wife. His sexual frustration (nicely shown by a post-coital slow motion clap on his shoulder by his wife)…