I feel that the physical side of domination supports the psychological aspect of it. I had an essentially vanilla boyfriend (seems like such a foreign word in here - "boyfriend") who could spank me until, as someone aptly wrote above, the cows come home, but it didn't even begin to touch my need for dominance, it just temporarily satisfied my want for pain.
I need someone who can handle me psychologically and intellectually, someone who is at least as intelligent as i am if not moreso, otherwise it's easy for me to manipulate the situation, which is the last thing i want to do, but when it's so tempting and so easy to do so, it's hard for me not to. Someone else wrote that most guys could manhandle them physically, but not mentally. That's me.
In addition to that, i am extremely intuitive. To make children be quiet in a class, some teachers will call them out verbally. With me, just a look not only made me quiet down instantly, it also made me feel badly for a while afterwards for being a distraction and causing my teacher to need to tell me i'd done something wrong. I can sense when i've said or done something that displeases the people i'm around. I learned when i was very young to watch people's emotions. Some of my family members were unpredictable emotionally, so i watched anger, disappointment, and disapproval especially and learned to sense what i should and shouldn't say or do.
To conclude all of this, i enjoy physical domination, but it's an assistant to psychological domination. I have to be dominated psychologically, otherwise i can't call it domination.