Pig Trough.

At the onset, "Pig Trough" seems a simple enough flick about a guy who likes to go to a sex club where piggish sex is the thrust. But it's not that simple. The opening scenes only hint at what is to come, leaving a double-length finale to hammer in the title. An astounding cast of true oinkers make that scene, in my book, an instant classic, the capper to an extravaganza of phenomenal heat.