I always thought references were for safety reasons not to determine compatibility or submissiveness. I havent needed them often but when ive been asked ive been happy to provide.

I normally let the Domme i used as a reference know with a quick email reminding them of our session date and details. I know some people ask permission in advance and that seems like a good way to go as well. Im just trying To be efficient.

Ive never had an issue with a domme being willing to provide a reference. My only problem now would be i haven't sessioned in a year.