Ines If fetishism has some role, is legit discuss there, however to become that on a sadomasochistic dungeon would not be allowed.
I think what will be enriching are contributions to the dynamics in relationships. In my experience, living together in a marriage is not a sure-fire success. Husbands and wives are too different in the way they approach things that there has to be a continuous exchange between the two. The expectations of the different types of relationships don't make it any easier. Sharing your own experiences and help with this can certainly help.
Any details about practices, I think, should not find a place here. If two people want to talk about it, they can do it another way, such as email.
