You're assuming the existence of a master implies the existence of slaves when there are many things that have a master but no slave. Master chief or masterball for example.
It only implies the existence of masturbate (or master bait), depending on the societal structure.
(Both are kinky.)
It only implies the existence of masturbate (or master bait), depending on the societal structure.
(Both are kinky.)
It only implies the existence of headslave (or headservant), depending on the societal structure.
(Both are kinky.)