RuPaul once claimed that there is “no such thing as monogamy” . Margaret Cho believes the prospect of only having sex with one person in life is “gross” . Angelina Jolie has said that fidelity isn’t “essential” to a happy relationship.

Over the last decade in particular, the open relationship has nestled its way into the 21st century’s love landscape, yet it remains a thorny subject.

“Everyone I meet nowadays is in an open relationship,” says Jo Foster , star of West End musical Why Am I So Single? , and now one of four leads in the revival of Jake Brunger’s play Four Play . “I think people our age, like, it’s more common to be in an open relationship than to be in a monogamous one,” agrees Foster’s co-star and former Mean Girls actor, Daniel Bravo.

Foster and Bravo play Andy and Michae

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