(1) The "fishhook". Why make whores look ugly, or uglier than they already are?
(2) The position where the dude fucks the whore doggy style and steps on her head. You know the one I mean.
(3) Gaping. I refuse to watch porn with no anal in it, but gaping is clinical and unerotic. Think of Draghixa Laurent. She was the best. Was there something worse for her scenes because there were no closeups of her slackened sphincter?