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Surprisingly but convincingly playing a couple of New Yorkers, Brits Rebecca Hall and Dan Stevens star in this bittersweet romcom.

They are long-term sweethearts who, on the verge of marriage, decide to sleep with other people as an experiment. Inevitably, the exercise soon has the duo in an emotional spin.

Gina Gershon plays the vampish rich divorcée who dallies with Stevens, while François Arnaud is a rock musician who gets involved with Hall.

The capable stars make this unusual and engaging comedy drama well worth watching.