Male chastity is the cornerstone of a successful femdom relationship.  You cannot trust your man not to masturbate.  At least not in the early stages of training.  And even in the later stages, if it is working, why change a thing.  Long term tease and denial with occasional release is how to keep a man beckoning to your every word.  Craving to satisfy you.  Craving to make you cum.  Enjoying cooking, cleaning, and serving you.  It all starts with his cock being locked.  What are you waiting for?