Respect, communication and boundaries.
I have always been amazed in my life at the lack of the use of these3 simple principles that people should abide by when interacting with any other human being in life. I have found that by using these as a basis of any meeting with anyone you are setting a really solid floor for success in that interaction in whatever it may be. In the world of cuddling these 3 I believe are SO key, and lead to amazing cuddles between pro and client.