NSFW - A follow up question about the psychology of sexual relationships?

This is a follow up to the question asking how you like your SO to treat you in bed.

It seems reasonable to say that many people enjoy playing either dominant or submissive sexual roles. Myself, I enjoy being very submissive and part of my pleasure is knowing that my wife is thoroughly turned on by being more dominant. I’m curious about why this turns me and some others on so much.

For those of you who enjoy the dominant role, what do you get out of it? Why do you enjoy it? What about those that are more submissive? What about that role do you enjoy? Or for those who enjoy both, or something else, what about you?