It protects themselves not the customer.
The man can still pass HSV (and possibly Gonorrhoea) to the woman through DATY so the restriction makes little sense. That said, Gonorrhoea is rare and most people that are sexually active and older have some form of HSV, mostly HSV 1.
I always find curious that Safe service providers only do CBJ to prevent STD's while offering D@TY. How is that safer?
It's ignorance
I think a safe provider should use CBJ and also CD@TY (dental dam they call it) without them there are risks. .
I think a safe provider should use CBJ and also CD@TY (dental dam they call it) without them there are risks. For many of us that love BBBJ and D@TY, we accept the risk.