A little verbal humiliation is OK, but shouldn't be overdone. I remember a great exchange where the girl is on her knees and, when her mouth isn't full, asks "are you a good boy or a bad boy?" "I'm a good boy" "Too bad, I like bad boys." "Yeah? I like girls who don't talk". You can see the realization sink into the whore's face that she has just been schooled, and that she really has no reply other than to keep on sucking.

The occasional "stage direction" isn't so bad, either, it is only when the stunt cock feels the need to grunt, groan, and generally make the scene all about him that it become unbearable. The same goes for when the cameraman does the Dirty Sanchez style hooting and hollering for the entire scene.