Last episode: Abstinence Makes the Heart Grow Fonder
Professor Macklin decides that abstinence will be the topic of the week. Owen and Natalie begin to rethink their relationship after she will not allow him to stay with her for a few days. This makes Natalie think about giving Richard a second chance. Lee, however, is having problems abstaining from gambling and sex and must take a loan from Richard to pay his gambling debt. Richard decides to hire Zoe to be the school newspaper’s new sex columnist, and Sarah almost gives her former professor/lover another chance, that is until she discovers that she's not the only student he has eyes for still.
Aired: Wednesday May 10, 2006

7. Risky Business	May 10, 2006	0 Reviews	9.07
6. The Passion of the Beaver	May 3, 2006	0 Reviews	8.85
5. Love and the Tenth Planet	Apr 26, 2006	1 Review	9.20
4. Zen and the Art of Manipulation	Apr 19, 2006	1 Review	9.24

Ernest Waddell - Lee Rasmussen Milo Ventimiglia - Richard Thorne III (photos) Victoria Cartagena - Zoe Lopez Penn Badgley - Owen Gregory (photos) Corri English - Natalie Dykstra Audra McDonald - Professor Carla Bonatella (photos) Peter Gerety - Harold Harper Matthew Modine - Professor Jake Macklin (photos) Tiffany DuPont - Sara Gregory (photos)