My friends and I had this joke going for a while about having sex while swinging in a hammock....we would say things like "wow, it would leave some interesting marks" (if it was one of those rope hammocks), "what if you fell out?", and the best one, "it would be SWING! orgasm!"
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Thinking about it, though....sounds like it might actually be kinda fun ๐ ๐ฎ