To be gentler, focus on what you can control, yourself, and not on the clients, whom you cannot control.
Me, as a client I try to treat the escort as a potential friend and hope he will do the same. If you have a good time with a guy, let him know and even offer something extra--a bit more time, another kiss, share something personal about yourself. Send a thank you note the following day. Clients are not cash machines and even the most cynical want to feel loved for a few minutes.