The 1973 Bernardo Bertolucci film Last Tango in Paris tells the story of an American widower who enters into a sexual relationship with a much younger, soon-to-be-married Parisienne. Starring Marlon Brando and Maria Schneider, the movie is famous for one thing and one thing only, and that’s a scandalous bottom-based sex scene featuring a handy slab of butter used as a lubricant. On its release, an Italian prosecutor dismissed Bertolucci’s dairy-friendly saucefest as ‘self-serving pornography’ and in 1976, the country’s Supreme Court sentenced the legendary director to a suspended sentence of four months in jail for his perceived depravity. It didn’t manage to dent the flick’s popularity at the video rental store, though…