I don't know what this movie was called, but it was a French film and it was basically boy meets girl, boy is aro, they get married, they are separated because girl can't stand lack of sex, girl becomes super-sexy, girl impresses boy, and they kiss in the end with the implication that they will go on to have a "normal" relationship.
It's not as messed up as some of the movies mentioned in this thread, but it is still pretty messed up.