'Three Stooges' Porn Parody You Can't Jack Our Comedy with Porn!

4/17/2012 6:18 AM PDT

The brainchild behind the porn parody, "Not the Three Stooges XXX" has been threatened by the guy behind the PG version that was released Friday -- to either put the brakes on the porn, or else.

Robert Benjamin, Executive VP and General Counsel of C3 Entertainment which produced the PG movie, fired off a letter -- obtained by TMZ --  to the lawyer for the triple X version, claiming the "low budget, clearly pornographic film" is not protected as a parody under the First Amendment.

But Michael Fattorosi,  the XXX lawyer fired his own letter back -- which we also got -- claiming the only way Benjamin could stop him is with a proper trademark, and Fattorosi says the only Three Stooges trademark Benjamin owns is for Three Stooges bottled beer.

But even more basic -- Fattorosi lectures Benjamin on the fact that a parody is protected as free speech.

The PG movie came in second last weekend, pulling in $17 mil.

We'll see how the XXX version comes in.