Both couples are miserable, the married one bored in bed, the unmarried woman almost maddened by her paramour's fondness for uttering ridiculous monologues in the throes of what passes, for them, as passion. How his male buddies can abide five minutes with him, not to mention a presumably life-long friendship, is beyond comprehension. What a guy.
Nothing constrains the screenplay, however.
It is resolute in its presentation of compounded misery in the ongoing war between the sexes. It makes celibacy seem like a nifty idea. Written and directed by Neil LaBute.