FRENCH BLUE (1976)

  This starts off with what's billed as the world's first porno cartoon as a pre-credit sequence then once the movie starts we get a behind-the-scenes look at French director Lasse Braun trying to figure out the mechanics of what might the world's first double anal penetration put on the big screen. In between these scenes we get a bunch of shortened loops also directed by Mr. Braun. One particular gross loop is titled CAKE ORGY and it mixes an orgy with a food fight. Probably of interest nowadays as a historical artifact more than anything all that titillating. Also more comical than stimulating. AKA PENETRATION and LASSE BRAUN'S PENETRATION (these versions appear to remove the animated sequence at the beginning)  

                Playing here on a double bill with another porn/comedy from 1975: