I don't get a real thrill from straight fucking. In fact, I'd rather not do it most of the time. And if I'm paying, then I think I have the right to choose what I like.
I love pussy. I love licking it, fingering it, tasting it, looking at it. So I'm willing to pay for that, and take some risk.
But if that isn't what you want, then you shouldn't have to do it.
I think, though, that guys should lay off this idea that they're doing it for the pleasure of the SP. I'm sure she'll say she loves it, and maybe she does, but the guy who loves DATY loves it for himself, not because he's an altruistic saint giving pleasure to all the SPs out of the goodness of his heart.
A GF of mine, who also used to work as an SP, said to me that if I ask her to tell me how much she wants me to eat her pussy, that's work for her. That's what she does with a client. If I'm going to eat her out, I have to be honest and say I want it for my own selfish reasons, and I shouldn't expect her to pretend I'm doing her a favour.
If a client eats out an SP, the proper thing for him to say is, "Thank You" not "Did you enjoy that?"