Check out the final scene in Debauchery 9 by Diabolic. The three girls are all getting analised in reverse cowgirl. There's a great shot of all them getting fucked in this position, a real smorgasboard for the eyes. Then, one by one, in true Jean Yves Le Castel style, the girls gape. It's red hot.

Flash forward to Christoph Clark's very underrated EURO DOMINATION 8. In the scene with Priscilla, janet Alfano and Kristine (Scene II of that film). An even better effect is produced when all three girls are side by side in a distant shot getting RCA treatment, and all gape, although if my memory serves me correctly not all at the same time.

The second scene of HELLS WHORES AND HIGH HEELS, the Tanya Hyde classic, also features three girls in the same style of scene, two getting RCA anal while holding onto a horizontal bar, while Nataly Dune gets CG anal.

The sequential gaping is a marvel to watch. I don't know what scene in porn shows more simultaneous gapes on scene. Perhaps an orgy film somewhere.

I'm interested in
(a) knowing why this sort of scene isn't shot more often in porn
(b) what other movies feature this glorious spectacle.