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The great Liza Biggs has the world on a string, and in this scene, she's got the world on a swing. The sex swing is one of the world's most versatile novelties. For the woman, it's as close to zero-gravity sex as it's going to get except for underwater shagging. For the guy, it takes the pressure off arm and leg muscles. It allows the couple to try positions and get deeper penetration that would be difficult on a bed or couch.