Sexual manipulation can damage a marriage. Instead of turning the bedroom into a battlefield, Dr. Phil tells couples how to negotiate their relationships.

Linda (left) enjoys bartering sex for high-priced items from her husband Dan. But Dan wishes their sex life resembled an act of love instead of a business transaction. Ken (center) regrets the day he told his wife they could have an open marriage, especially after finding out about her 10 affairs. Chris (right) admits to giving her husband bad sex so that he'll "stop asking for it."

View these stories and Dr. Phil's advice. 

Update: How are they doing now?