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This guy, Tom, decides to go to a porn theater. He buys a ticket, walks inside, and has a seat.
There aren't too many other guys in there, but the few that are there are all wearing trenchcoats.
Wouldn't you know it, but another guy comes in, and sits right behind Tom. During every sex scene, this guy makes all these weird huffing and rubbing sounds. Sometimes Tom can't even hear the movie over the breathing and slapping sounds.
This goes on throughout the movie until the final scene, where everyone in the whole world is having sex onscreen. The guy behind Tom is mysteriously silent.
Tom can't help but wonder, so he turns around and asks, "Hey, buddy.....where's all your enthusiam?"
The guy looks back at him with a big cheshire-cat smile and says, "Heh, it's all over your back, dude."