It revolves around the challenges a couple have to face after they promise each other an honest and open relationship in which they can have sex with whoever they want but after telling honestly.
Did they have orgasm with that person or not, they have to tell this too. Little details I mean. And I won't say it is wrong or something, because no one is wrong, it's just that everyone has their own way of looking at things, so for the viewers, don't go all crazy while watching this because this might be something you would not have watched before in your life! If you'll watch the movie, you'll get a feeling that none of both was actually happy with this, so at last this concept failed for them, and they accepted each other.
Great movie I would say must watch!!