(Maybe this should be moved to Media and Erotic Lit?)
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From the Golden Age of plotted porn. I don't remember the title or the main plot. In a sub-plot, Jamie Gillis is a porn director, making a movie about the Civil War. (The title of the movie in a movie might be "Fuck, You Fuckers!") Lavish sets and costuming. There's a row of (maybe 6? 8?) Union soldiers and a row of southern belles in giant fluffy dresses and curly blond hair. They are paired up, acting in unison. At some point, Gillis shouts his directions. "Fuck, you fuckers!" The belles turn around in unison, bend over, their big skirts get flipped up and over their heads and the Union soldiers start fucking them (kind of standing doggie) in unison. After a few minutes, Gillis shouts his next direction: "I want a cum shot! Give me a cum shot or none of you fuckers gets paid!"  The Union soldiers withdraw in unison and decorate the ass cheeks of their belles.  
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"Give me a cum shot or none of you fuckers gets paid!"