I've been with a few ladies who make "all clear" phone calls at the beginning of a session. None of them have known my real info. But since I do only outcalls to hotels, it would not be hard for the cops to find out my real ID if something happened to the lady. And, I assume the ladies who don't make the phone calls have left the pertinent info with someone else.
As far as I'm concerned, it is a critical part of the hobby. This little world of ours operates in the shadows of trust and deceit, reality and fantasy, legality and illegality. Keeping our world safe is in everyone's interests.