I presented my DL to 
one provider who let me know in advance she would be asking to see it before the session began. I also knew this was going to be part of her screening system from reading the provider's numerous (glowing) reviews and was prepared for it.
 
Her reason was simple - a photo ID would confirm my identity and the birthdate in P411 info. The provider glanced at my DL and handed it back to me. Unless she has photographic memory after a 90 minute session, my info was long ago forgotten... 
 
After the session began and we were both 
recovering, she shared several examples where stolen P411 / Date-Chek info was provided to make a date, but when the client ID didn't match, she left immediately.  
 
Upon arrival, this provider even "cased" my room, looking for interlopers, cameras, wires, etc. before proceeding. Ever have a provider check the room's microwave? She was the most security conscious lady I ever met...
 
Did I like sharing this RL information? No
 
Will I do it again?  Depends on the provider's M.O. and reputation...special circumstances only.
 
H