Whether sex addiction is a real disorder or just an excuse for bad behaviour. Marcos and Yvette say they are unable to stop having affairs and Staci says she meets strangers for sex anytime and anywhere.

"The Bachelor" star Gia Allemand's mother discusses her recent suicide, and co-star Jake Pavelka gives an emotional tribute.

Dr. Phil sends a private investigator to check up on guests' fiances, whom they have never met in person; a woman flies to Nigeria to confront an online con artist; the man whose identity was stolen to lure former guest Dawn into a fake relationship.

A teen football star accused of rape and his accuser speak out about how one alcohol-fueled night changed their lives in an instant; his parents insist that their son is innocent and that the girl just wants attention.

A 16-year-old girl says four classmates raped her while she was intoxicated; one of the accused and his parents react; Leah says her 17-year-old daughter committed suicide after being raped and bullied; Alexis says she was also raped as a teen.

Self-professed monster-in-law Khalood returns with shocking news; her daughter has a heart-to-heart with Dr. Phil.

The parents of a missing child come together to tell Dr. Phil why they believe his stepmother may know more than she is admitting.

A mother learns the details of her 17-year-old daughter's online and offline activities.

The parents of a 15-year-old girl who appears to have been abducted and killed by a man she met on Facebook come forward to share their heartbreaking story.

The mother of teen "Modern Family" star Ariel Winter, who lost custody of the girl amid accusations of physical and verbal abuse, tells her side of the story.

Nick Carter of the Backstreet Boys discusses his struggles with drugs and alcohol; a teen high-school dropout admits to abusing drugs, stealing her parents' car and dating a man nearly 10 years older.

Parents say their teen daughter is making dangerous choices and confront her much-older boyfriend for the first time; Nick Carter performs.

Rapper DMX discusses his drug addiction, erratic behavior, arrests and a streaking incident caught on tape.

A woman living the high life suddenly falls deep in debt when her husband files for divorce; 28-year-old Steven still lives at home, on his parents' dime.

Nichole's husband denies getting violent when he drinks; a couple say their son's rage is out of control and they fear for their lives; two survivors of a road-rage incident caught on tape tell their story.

A 19-year-old beauty queen says her career was ruined when young women sent compromising photos of her to pageant officials, and she faces one of the former friends who admits to sending the images.

Bridgette says she is terrified of her abusive, controlling boyfriend, but she is too fearful to leave him; women who survived brutal attacks by their exes tell their stories.

A young woman who was the only survivor of a drunken driving accident that killed two of her friends tells of her subsequent reckless behavior and leaving others to care for her infant son.

Jessica's fiance says her anger and drinking are out of control, causing chaos in their blended family; the husband of a woman who lost 100 pounds does not support her transformation.

A woman wonders whether she should marry her brother-in-law to fulfill her deceased sister's dying wish; a wife says her shopping addiction is ruining her marriage; an obese former beauty queen asks why she is afraid to slim down.

Holly says her sister Andrea is ruining their relationship because of her bullying and attacks on people.

Tina's syndrome causes her to harm herself to get attention; Samantha fakes illnesses.

Two couples' explosive fights are caught on tape and destroying their marriages.

At 11 years old, Hope got pregnant with then 13-year-old Bailey's child.

"Golden Sisters" Mary, Josie and Teresa; women who date much younger men; actress Tami Erin.

Malinda says she is in love with a registered sex offender and does not plan to leave him, even though she has a 4-year-old daughter.

Family members take polygraph tests in an unsolved murder case.

A couple say their 20-year-old daughter went from being a straight-A student to a heroin addict.

Lisa says her longtime husband is verbally abusive and controlling, sending her into the arms of her boyfriend.

A pair accuse each other of being a poor parent to their 16-year-old son; Alysia says her mother neglected her and her siblings, leaving her to be the mother figure.