Are you confusing submission with trust? Certainly sharing your body with someone requires a lot of trust. Pregnancy, STI's, ...just imagine a woman going down on a man... all those teeth! A lot of trust is required!
Discussion
I don't think I'm confusing those terms, but I see trust as a prerequisite to fruitful submission. I tried to define my terms in the response to your question about hierarchies. I don't know how to link notes, I hope this works.
Submission is for your enemies. It is something you beat someone into. Trust is for your loved ones. It is something that is earned.
When you love someone you support and protect their autonomy.
I strongly disagree. For me, submission is not a pejorative and certainly not limited to adversarial dynamics. You can voluntarily submit to authority, submit your body to manipulation by someone you trust (a surgeon, for example), submit to a court judgement and so on. Violence is only one, and the least desirable, way of establishing a hierarchy. Trust is a better one.
On a religious note, alluding to a thread you started elsewhere - when mystics speak of submission to God's will, they certainly don't mean being beaten and guit-tripped into conformity (the Protestant way), but a voluntary and deep conformance to the deepest structure of reality.