This is probably pretty broad and subjective at the same time but I would be interested in seeing scenes where it is obvious the guy REALLY enjoyed the sex immensely (ie. vigorous thrusting, massive loads etc.) while it was just kind of "ho-hum" for the girl. I'm not interested in scenes involving pain, domination, humiliation or misogyny in anyway, just the guy banging away like crazy and the girl being like "whatever..."
Krystal Steal comes to mind. Not necessarily for disliking the sex, but for some of her candid expressions regarding cum, that can almost suggest it. I'm not sure if its what your after, but some girls have an ever so slight snobbiness about them, that consequently carries an unmistakable allure, when ofcourse, they perform with those of the hardcore variety. Prude behavior in the softcore arenas, is basically business as usual, and in Steal's case, and imo, despite her hardcore titles, it originates from similiar roots.
Veronica Jett otoh, will often cast a smug glance, or occasionally bust out with that short, condescending giggle, that insideously stamps "dunce" on the forehead of any unsuspecting partner, who may be missing a clue or two.
Whether deserved or not, her repertoire of extremes, more than backs up any cheeky behavior, and particularly when pounding her ass cheeks into oblivion, has no effect on the matter. Its that combination of attitude, and willingness to consistently deliver the goods, which has placed her, and her unique charms, among my favorites.
Mia Serene aka Mia Sonata in More Dirty Debutantes 31. Her scene with Ed Powers. During spoon it looked like was sleeping. There was no life in that body.
You just haven't seen any of her good scenes. I will have to come up with some later. Anyway, Allysin Chaynes comes to mind. To me she almost never seems into it. Also, Tera Patrick, as beautiful as she is, she is out there.