BTS scenes are the best. They really give character and personality to the actresses and also some interesting insight on how the movies are made. Unfortunately, sometimes it also breaks the fantasy.
Anyway, Milky-Cat has a few BTS scenes as DMC-24 which briefly shows the aftermath of swallowing a pitcher of jizz. And my fav BTS from Dogma's DDT-154 which shows off the cute personalities of the actresses in-between being blasted with sperm.