"I thought maybe we could trade something that the other sex has," Karyn said. "You know, like swap chests. You can have my cleavage. Or maybe we can swap genitals, hair ... I could even loan you my womb. I'd love to have sex without worrying about having a baby."
Jon thought for a moment, then said "Only if we do it with a time limit. I'm not playing for keeps."
"Alrighty then," Karyn said.
Jon held the stone in his hand, then said "I wish that for the next seven days, Karyn and I would have our genitals swapped." The stone glowed, granting his wish.
Then, suddenly, he felt something missing from his crotch ...
