When Dr. Phil last tackled the topic of the other woman, the debate got so intense, he kept the conversation going! Sarah Symonds, leader of the online group Mistresses Anonymous, and Steve Santagati, author of The Manual, return to share their beliefs of why some men are unfaithful. Plus, learn how to affair-proof your marriage.

Dr. Phil weighs in on infidelity. Read his blog, and leave a comment!

Inside the Mind of a Cheater
Why do men have affairs, and why do women date married men? Sarah, a self-proclaimed infidelity analyst, and Steve, who says he researched why men cheat, share their theories. Plus, Melvine, a former guest who says she was cheated on, challenges Steve's views.   

"Why we cheat is because we're idiots!"

In the Hot Seat

Several audience members take Steve and Sarah to task. Plus, a woman with 11 brothers gives insight into why men stray. 

Don't miss their heated discussion!

Mistresses Speak Out

"I've got a wall around my heart now."