His Mother's House (1974)

"Petter (Svein Sturla Hungnes) quits his studies, and break up with his girlfriend. He moves back to his homeplace, to his mother (Bente Børsum) who lives alone. There has always been a good relationship between Petter and his mother, and she doesn`t mind that he moves back home. When Petter finds a new girl at his homeplace, his mother reacts in a negative way.
"This film is based on Knut Faldbakkens book "Sin Mors Hus" ("His Mothers House"), and was feared by the people in the filmbusiness in Norway due to its strong sexual content. Still it became a huge sucess at the theatres. It`s today known as one of Norways strangest films of the 70s" -- IMDb user comments