Premise: Common Law Cabin (original title "How Much Lovin' Does a Normal Couple Need?") is a 1967 exploitation film directed by Russ Meyer. The movie features Alaina Capri and Meyer regulars Babette Bardot and Jack Moran. It was co-written by Russ Meyer and Jack Moran, and filmed on location on the Colorado River in Arizona. Other portions of the film were shot in the Coachella Valley, California.
Hypothesis: The Colorado River runs through Arizona.