This is the huge missed point about Watson. He didn't just want some hot ass he could easily pay for to do what he wanted, his depravity lies in having an unsuspecting massage therapist confronted with and uncomfortably obeying his commands to touch his taint, anus, testicles, etc.
He could have found plenty of women to play that role for cash or company, but it wouldn't have been the eyeball jizz inducing intensity he so desperately craves. And also why, there is a good chance he will not be able to resist repeating the offense at some point in the future.