Original:  Physics student Darth Vader and his former roommate, Master Yoda , decided to hire a nude model to engage in intercourse with a well-known marine  in order to predict how URLasms can occur in the body.
Revised:  Physics student Darth Vader and his former roommate, Master Yoda , decided to hire a nude model to engage in intercourse with a well-known marine fossil record in order to predict how URLasms can occur in the body.
Edit intent: meaning-changed