I guess it depends on the session really. Sometimes I like it sensually, whispered in my ear, the things that will be done to me or wants me to do.
Then there are those times where it's more of an aggressive, throaty, passion induced "I need your cock now" kind of thing.
So many providers attribute dirty talk with PSE style sessions. I don't know...is it still "dirty" when a woman leans down into you, presses her chest into yours during a nice CG session and whispers in your ear as she bites it "I love riding your cock."
That's a lot different than going to town doggie style, sweating your ass off as your pounding hard into her and she looks over her should saying things like "Spank my ass. Fuck me harder. Oh yes, spank me baby. Harder, Faster, Deeper."
Personally, I like it all, as long as it fits the session mood.