Similar to that of a stunt double, a stunt butt is someone who replaces a male porn star when the pounding becomes too intense or a fuck stunt may be too dangerous for the star butt. A stunt butt can be identified by a gaping anal orifice and bruised buttocks. They are willing to take exorbitant amounts of cock to their anus for the greater good of a porno. Stunt butts must continuously adapt to and perform new fuck tricks brought into the porno community.
Stunt butt credo: "Fuck it"
Director: "CUT! O.K. Peter why don't you take five and we'll get the stunt butt in here for the flying sausage dive."