

Anna and Will, were each other’s first every-things: first kiss, first love, first and only relationship. Now, 10 years in, at Anna’s 30th birthday party, as Will is about to propose, the couple’s best friend makes a drunken toast, suggesting that they should sleep around before their inevitable marriage. The joke lands like a lead balloon, but the thought lingers until Anna proposes that they try opening their relationship – as a sexual experiment.




Rebecca Hall
Anna

Dan Stevens
Will

David Joseph Craig
Hale

Morgan Spector
Reece

François Arnaud
Dane

Gina Gershon
Lydia

Jason Sudeikis
Glenn

Raúl Castillo
Heron

Sarah Steele
Stevie

Michelle Hurst
Dr. Bennett

Bridget Everett
Charlie
Lindsey Elizabeth
Tiffany (uncredited)
Axel B. Crano
Axel
Marc Iserlis
Guy At Bar
Mariola Figueroa
Young Woman
“How can you be certain he is the one, if he is the only one?”
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