In a bizarre psychological experiment, two men face a Prisoners' Dilemma-style choice: fuck the attractive lab assistant or resist her teasing. If both resist, each gets a handjob as a prize. If one fucks while the other resists, the man who fucked goes free, and the one who resisted gets his balls crushed. If both fuck, they both get their balls crushed. One man ends up getting his balls crushed after his partner fucks the lab assistant's ass, dooming his friend's balls.