Cutting Moments (1997)

In the center of a monotonous suburban existence, Sarah lives silently and in subservience to her icy husband Patrick. They have been together far too long, and Patrick's affections for his wife have all but vanished. Instead, his sexual urges are tempting him to lust after their own son. Realizing how far gone her husband is, Sarah undertakes drastic, shockingly sickening measures to salvage some sense of her life and purge her years of festering resentment.