Those Mad, Mad Moviemakers (1974)

A film about making a porn film that does not include any actual pornography. Novel though perhaps disappointing to anyone expecting it to include something more substantial than the usual ogling of cleavage.

A taxi driver who works in and around Hollywood fancies himself as a director. A chance meeting with a real director sees the script of a porn film fall into his hands, and he has the crazy idea of turning it into the real thing. As he has no money worthy of the name he has to dupe others into funding it, including his mother-in-law and his boss. And as his experience is limited to directing the odd amateur play, he decides wisely or not so to bring in someone who knows what to do, an acquaintance who has directed many porn films.

Clearly "Those Mad Mad Movie Makers" was never meant to be a porn film. Sadly, it gives the impression it was never meant to be a comedy either.