? — Swingers, like polyester leisure suits, seemed to have their heyday in the ’70s. But couples who openly swap partners for a night of passionate sex with strangers, are becoming a growing trend in a sort of new sexual relationship revolution — and those who swing say the rest of us monogamists are missing out.

«Nightline» went inside the top secret world of swingers — as guests, not participants — to a highly provocative masquerade party at a hotel in New York City hosted by a group called Behind Closed Doors. (más…)