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Casual sex is celebrated in this bawdy rom-com which pitches Natalie Portman and Ashton Kutcher as a couple of former schoolmates who keep on mating for fun in a strictly "no-strings" relationship. Except that Ashton's fallen in love. Comedy veteran Ivan Reitman (Animal House, Ghostbusters) keeps the smut 'n' sauce coming while there's game support from Kevin Kline as Ashton's randy old dad and Lake Bell as a ditzy production assistant.
