This movie, despite what many reviewers seem to think, is about the differences between men and women with respect to sex and love. Whether it is with Oscar and Mimi's intense, wild, no holds barred relationship, or with boring, bland Nigel and Fiona.
Generally speaking, men can have sex with any amount of women, in any way or intensity. If she is up for it, chances are we will be too. Women on the other hand, require more of an emotional connection to the men they sleep with. The need to develop trust and comfort before completely letting go.
Oscar is the ultimate poon hound and became instantly infatuated with Mimi. They start with a normal passionate relationship, but ultimately, the excitement wears off. This happens in any and every relationship. They hike up the intensity by getting into bondage, S&M, etc. All the while, Oscar is all to aware, they are heading for the their peak and once it hits the top, it is only down hill from there.
The thing is, for the man in this case, it is only about the sexual passion. The woman is truly in love and the sex is the connection to her man. Even when the sexual excitement wears off, Mimi is still in love.
So, enter the conflict. Oscar is done, wants out. Mimi can't handle it and doesn't understand why he could possibly not love her the way she loves him. He tries to be compassionate and break up but she refuses to be let go, ultimate agreeing to be his slave just to stay near him.
This story is being told to a couple who have also been together for 7 years and are off to reignite their marriage. I believe that the same factors are in play with the stuffy British couple, Nigel and Fiona but only in a far more repressed manner. He's bored because he and his wife are doing the "normal" thing. No wild, kinky sex for them. But the emotion of love is there. If a couple is going to stay together forever, they simply have to get over the fact that physical passion is fleeting and if the bond of love is strong on both sides, they can make it work. Nigel isn't clear on this until the climactic ending.
This commentary isn't so much on the details of the plot, but what I believe the movie is trying to get across. Read the other posts for more details, but to understand what the movie is saying, understand that sex is sex for men and sex is love for women.
