NEVER GET MARRIED: The Downward Spiral

Movie description: Keiran and Dana have fallen madly in love. After years of of the lovey dovey phase, their sex life has come to a complete halt. The solely way around the bickering and the blaming and the frustration is for 'em to let it all out with raw uninhibited sex. They pretty soon realize they aren’t the people they thought they were when they 1st met.