okay, I will throw in my 2 cents on this.

Most people accept and recognize 3 levels of submissive and Dominants

if all you do is scene or play without any further comitment to each other then they are bottom and Top.

If there is a further comitment to each other beyond the scene or play then they are sub and Dom

If there is a long term wide ranging comitment to each other where the Dom has the last word in all things and the submissive can't bear the thought of NOT BEING OWNED then they are slave and Master.

Most progress from the lowest level to the sub Dom level and go no further but for those that consider themselves to be 24 7 then they have made it to the highest level slave and Master.

I don't agree that a slave can't have a safe word, that is insanity what happens if she has a physical problem during a heave session, I have had the experience, she need that safeword but since she is slave she will not use it unless there is an extreme need.

Russell