Couples when they get married usually believe that they are on an equal footing and that marriage or their decision to live together gives them the permission to express their feelings and wants with an expectation that they will be respected, to state their views and opinions with an understanding that they will be listened to, and to say “no†openly without feeling guilty.
This does happen in many partnerships but there is no guarantee that it will in all, for sooner or later many couples will feel the discomfort of an imbalance in their relationship. This disparity will become noticeable when for instance one partner asks their partner to do something that they don’t want to do. It may be something simple as to go out with people they dislike, or more complicated as packing their bags and moving away from family and friends. In either case due to one partner’s inability to say “no†they submit to the request thus magnifying the inequality in the relationship.