This is a good topic. There is a sub from many years ago that I still think about and wonder what the best way to have told him that we weren't a good fit. Without going into detail, his fetish was just too much for me. It left me feeling nauseated. When he called to book another session, I told him why he should find another dom. I was polite about it. But, it hurt his feelings. It seemed as if it made him feel bad about himself and took all of his good memories away from the first session that left him on cloud 9. I've not come up with a better way to have handled the situation although there must be one. It's good reading input from other posters.