Being an Escort and a Professional IS and should be separate, there are Professional Dominatrix who also offer escort services and they are glorified escorts. A Professional Dominatix would be putting herself in a submissive role, if she offer/has sex, which defeats the Principle and Meaning of a Professional, A sub should be clear and the Professional Dominatrix should be clear what is offered from the start. A guy should not go into a session, possible, thinking he will be getting sex from a Professional Dominatrix, if he does, then she is just an escort. These are just what I have followed, seen, even been and taught classes on this.