Really good point that brings up the point that: if you have a "main" domme, you can make asking for references a fun part of the play. I had a main domme where this eventually evolved to: if I wanted to see another domme and ask for a reference, I'd send her a 10s video of me on my knees (no face showing), asking permission to see Mistress so-and-so and permission to list her as my reference. If she approved it (she usually did), I'd send her a cheap little something off her gift list. In all honesty, all of this was more for me than her -- I loved asking her permission, I loved the theater involved, and the little gift assuaged any inappropriate guilty feelings I had over it.

Obviously, if you're mistress-hopping or don't have a single mistress you're most devoted to, this won't work