I don't get just going into a therapist and asking to skip over the main thing they do. For me, part of the excitement is wondering whether or not something might happen at the end. Wondering whether that little graze across the boys was a legitimate accident, or a message of things to come. The little give an take between both to let each other know it's OK.
Little thrills in life.
Still, people should understand that if anyone doesn't specifically advertise certain things, it's going to be a YMMV, and they should just enjoy the massage and see what happens. If they want something specific, go to the people that specifically offer those things.