Almost all of them have gloves. You just have to ask. Just say, “ you go inside?”. They would prefer doing PM to anything else because it requires the least amount of energy input of all the services available. Plus, it quickens the release and they can move you out faster.
I find that most providers don’t have an accurate understanding of male physiology, especially the young hot ones. But the older ones that do know how things work in there demonstrate why 500 million gay guys are not wrong.