I don't fear my wife when she dominates me, but I do feel apprehension about what type of punishment she will administer. I'm never really sure what she will do or how hard she will do it, and as I am almost always bound and blindfolded, there is an intense feeling of a lose of control. I really enjoy this sensation and as my wife knows me very well, she is able to keep me just on the edge of breaking for an extended period of time.

I would say that this doesn't only create trust, but forges a very deep bond. The intensity of the experience, and the trust you require to allow it, create an intimacy far beyond just sex.