The story that was narrated backwards!

This was from the director of 'Irreversible'. This story was told in backwards. It opened with a married couple having sexual intercourse and after a phone call, the flashback rolls. Which begins from that point of the story where it stands to where it all began as per the film character who recalls all the events. Actually, it was impressive idea, not that reverse way storytelling, but how the characters were drawn. And then the story was very simple, like the film '9½ Weeks', the drama and the sex parts shared the remaining narration alternatively... read the rest.