If a client sends me references solely from escorts I usually make sure to include a gentle reminder that I don't offer such services.
So far it's worked out pretty well.

The only client who has really harassed me during and after the session gave me reviews from massage girls only. After our session he left a nasty review because I didn't provide "more" and I noticed his handle had many such reviews, and most were for escorts that didn't stay in the business very long. So it's one piece of the puzzle but it's more of a passing thought than anything I would use to prejudge or reject someone.

This is a great post and I, too, am curious about the answer because I frequent both. Although currently my only regular is a FBSM girl, I have used escort references for FBSM providers in the past.

Sometimes you feel like a full meal and sometimes you feel like something light. I guess I can't speak for everyone, but I certainly know the difference when making appointments with escorts vs FBSM, although I have had FBSM girls see my references and get a bit nervous and remind me of their service limits, which is fine. That's a good practice and a very simple way of setting the expectations. If a guy is going to try to push the limits that have already been established, it's because he is an asshole, not because he has seen escorts in the past.