from www.tmz.com – The owner of The Flying Pig catering truck not only KNEW he whored out his famous vehicle for a porn flick — he asked for a FREE COPY of the DVD … so says the company behind the XXX movie.

The people over at Metro Movies, (who produced the flick under the name Cheeky Monkey, Inc.), fired off a response to Flying Pig — claiming they never deceived the owner about their XXX intentions … and they can prove it!

Metro Movies says they have letters from Flying Pig staffers in which they “repeatedly confirmed” that they knew Metro was in the business of bang-bang and still signed off.

In fact, Metro claims after the it all went down, the owner watched the DVD and raved about what he saw … saying in a letter, “SEX + FOOD + FUN = well, just about all my favorite things! A 10 for sure.”

The porn company says they have no plans to stop the release of the film — as Flying Pig demanded — because the truck people knew exactly what they were getting into.