I always try to incorporate edging and orgasm denial for the sub a few days prior to the session if possible. My email instructions literally say I want them hungry and pliable. You must seriously have a hair trigger if you need to masturbate minutes prior to a session. Be careful in those parking lots

By the way, I don't honor safe words for fears of premature ejaculation. If it happens, it happens. My agenda does not change. However, if a client wants to bail after because he is embarrassed, I let him. Has happened only rarely. Most don't want the party to end just because they couldn't contain themselves.