Britain's raunchiest ever movie - charting a couple's relationship from the first date to break up - is set to open in cinemas this weekend.

"9 Songs" directed by the "24 Hour Party People" director Michael Winterbottom, features actors Kieran O'Brien and Margo Stilley having real life sex, reported Sky News.

Its release has sparked controversy across Britain after one newspaper described it as "the most sexually explicit film in the history of British cinema".

When asked why he had made "9 Songs", Winterbottom replied: "Why can a writer engage in sexual imagery with no restrictions and yet a film author can't do the same?"