Rachel and her stepsister Camilla were a couple of hot, sex-mad cougars. Barely a day went by without them fucking some fit young stud - whether the pool boy, pizza delivery guy, repair man, or a random pick-up. The siblings teased each other about who was the bigger nymphomaniac. Rachel thought it was Camilla. Camilla felt sure it was Rachel. One day, to settle the dispute, they made a bet to see who could go the longest without sex.