There isn't much that turns me off more than a girl that makes it look like what she's doing is the biggest fucking chore in the world and making it extremely obvious that she isn't enjoying herself and would give her left tit to teleport forward in time to the moment when she's cashing her check. Oh, and the ones that grimace, gag, and bitch about getting a load in the mouth/eye. I've also noticed a trend; the majority of the girls I've seen that act like that are fucking black chicks.
Well, she is either WAY distracted by the camera guy and can't get into it, or she's a poor actress and can't fake it worth a damn. Either way, what gets me, is she's double dipped, ass to mouth and LICKS his asshole, YET gags (I believe to be genuine) when he jizzes on her tongue.