We Are All Naked(1966)

A poverty-stricken family lives in a rundown shack on the coast of Northern France--Dad (Jacques Normand) is a foul-mouthed drunk, Mom (Rita Maiden) likes to make it with random strangers on the beach, their son (Gérard Dessalles) is mentally handicapped and their six-year-old daughter (Isabelle Pierson) is oversexed.