Circle of Two is a 1981 Canadian film. It starred Richard Burton as a 60-year-old artist who falls in love with a sixteen-year-old played by Tatum O'Neal. It was the last film directed by acclaimed film noir director Jules Dassin. Controversially, O'Neal - sixteen at the time of filming - posed for a topless scene. The film has been distributed by B-movie company Troma Entertainment. It has also been distributed under the title "Obsession."
(Summary from Wikipedia)