I fucked a Hungarian chick in an open marriage for a month or so a few years back. Met her husband at the same party I met her, and she came over to my place the next night. He gave me the green light and everything.
They were tourists spending two years traveling the world. "We want to party with the locals of all the world, and we want to fuck the locals of all the world." They reckoned they'd finish up their tour, go back home and be monogamous after that.
The night before they left, we all had drinks with a few friends at the place they were staying. She went home with me, and I dropped her off at the airport the next morning and shook her husband's hand and we wished each other well.
Other than that, I have known two couples that had open relationships and they were both fucking trainwrecks.
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