I think that people are using "ownership" to mean "who is in charge". It's an expression of autonomy. I "own" my body in exactly the same way as I "own" myself

I think that people are using "ownership" to mean "who is in charge". It's an expression of autonomy. I "own" my body in exactly the same way as I "own" myself because my body is one of the things that constitutes my being. If I don't own my very being, then I have no actual autonomy.