Kay

“The fact that we have authority structures in human relationships is irrelevant. What must be demonstrated is that there is authority of the literal anatomical head over the anatomical body. Without that, it can not be proven that Christ as the metaphorical head over the body has any authority over that body.”

Well put, gengwall.
Case in point: slavery – the authority structure of the master/slave relationship which we now find abhorrent, was once unquestioned.