Looking for this non porn IR movie. Anyone know?

So this isn't going to be much to go by and I'm pretty sure I won't end up finding it but years ago (14 years or so) my x was watching this movie in college that was part of a class. Basically, this white woman had and affair/fell in love with a black man but she had a white husband. At the end of said movie, I happened to catch a few seconds of it and she was making love to her husband and the camera shows her looking up at the ceiling and likely thinking of the man she had an affair with. No expression on her face as she was letting her husband/boyfriend make love to her.

I don't recall which class this shown in but I have googled the ending (or what I recall of it) and have found nothing. Since this movie was shown in class around 14 to 16 years ago, I'd surmise that its at least 20 years old but my money is on much older. It seems to be a movie that you would remember if you watched it since the ending was memorable. Staring at the ceiling with zero feeling or pleasure while thinking of her lover but having sex with her husband was very telling. If anyone happens to believe this sounds familiar to them, I won't know the name of the movie even if you told me but I'll definitely look it up if someone has an idea as to what it is. Any takers?
 
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