Orich, listen to Steady, this is sound advice! Also, listen to Puppy, it is time to start implementing some of the advice here, and not being so timid.
Take control of your own life, start to respect yourself, and do things for your self. That way your wife will respect it, and that is what your wife has to do again. Respect you.
But like Steady says, do it for you and not for a reaction from her, that is the only way it works. It is this whole zin like thing that the reaction you want from her only comes when you are not doing it for her.