A Perfect Murder Starring Viggo along with Gwenyth Paltrow and Michael Douglas. The movie "Unfaithful" follows along these lines and I think (in some ways) copied this movie (just changed the plot around a bit). It's essentially the same movie, only think is Gwenyth is not an older woman going after a younger man.
Viggo is the one who has an affair with her, and there are actually original pieces of his art work in his 'studio' flat in the film. That's why i rented it...oh, and to see Viggo get it on.
Some stills:
Funny watching Viggo as the 'hot younger man'...I'm so used to thinking of him as the 'hot older man'.