I have a particular ex-provider with whom I enjoy this activity. I almost exclusively do this with only her. Just about all of our sessions start with some relaxation in the hot tub. Got to get the field of play ready if you wanna go there.
I had a provider do that to me right after my first Brazilian wax. It was enjoyable busting that boundary and she was quite skilled at it. Haven't had anyone else do that with me in the escort world.
I agree, it is very much a YMWV thing.
However, if I go down on you and we wind up going there by mutually enjoyable feelings at the time, there should not be an upcharge or jumping me into a higher "PSE rate". It's not like it fucking hurts like penetrating butt sex for Pete's sake. If it does, I need to know every menu item that constitutes PSE rates before booking with you.