Two married couples are forced to share a hotel room.

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Sometimes there are moments in life that have the potential to radically alter the course of your marriage. For my wife Lara and I, that moment happened on the first night of a vacation in Aruba.

We'd been married for 11 years and it was the first time we'd left the kids for more than a night. We were with our friends, Bryan and Stephanie, who were basically carbon copies of us. Like us, they'd been married for over a decade and had two kids. Like us, they were both professionals who had met in grad school. Like us,...