A woman suspects that her brother-in-law is her baby's father; a man denies being the birth father of two women's baby; after an Internet romance come twin babies.

A woman's fiance says his Internet girlfriends have never really met him; a woman suspects her boyfriend of cheating; a man tells his girlfriend that he went to a family reunion for two months.

A man says his children bear too great a resemblance to another family member; a woman wants her former boyfriend to admit to being her baby's father.

Fashion nightmares swear they look sexy in their outrageous outfits.

Sisters find themselves sharing a man; a town football star denies being a baby's father; a couple had an ideal relationship until he began denying paternity of her child.

A guest denies he is the father of his two former fiancees' babies; a pair learn whether he is the father of all of her children.

Outrageous moments caught on tape may make parents think twice about who they trust with their children.

Sexy decoys tempt men accused of cheating; a guest learns whether her best friend cheated with her man.

Guests learn the results of paternity tests.

A woman says there is no way her biracial son can be the father of a blond, blue-eyed baby; identical twins raise the child of a man who denies being the father; a man says he is not the father of two cousins' children.

A woman wants her son's girlfriend to take a lie-detector test to find whether she is cheating; an older man wants his young fiancee to prove she is not stepping out on him; an older woman worries that her much-younger boyfriend is sleeping around.

A ballplayer takes three paternity tests; a man who participated in a threesome worries that he may not be the father of his wife's children.

Desperate families ask for help to find their missing children.

A man takes a DNA test after his "friend with benefits" gets pregnant; a woman wants to know once and for all whether her ex is the father of her child.

Guests learn the results of paternity tests.

A guest says she found her fiance in bed with her mother; a man is caught in the middle of three sisters.

Past guests tell what happened after the cameras stopped rolling and they returned to their lives.

Motherhood does not stop some teens from partying and living dangerous lifestyles.

A guest says her husband cheats; a woman says her younger boyfriend tells people that she is his aunt; a guest denies paternity of a child.

A man admits to offering to pay his sister-in-law for sex, but says nothing happened; a guest is put in a dressing room with a hot decoy; an older woman fears her young boyfriend may be cheating.

A woman wants to know whether her husband or her online boyfriend is her baby's father; a man denies being the father of two women's daughter.

Maury's team of specialists work their hardest to get controlling men to end their dangerous cycle of abuse.

A boyfriend reveals a secret that may alter a relationship; an engagement depends upon the results of a lie-detector test; a guest fears that her beau is cheating on her again.

Guests learn the results of paternity tests.

A man has DNA tests to see if he is the father of a newborn and of a 23-year-old; a guest denies that he is the father of his online girlfriend's child; a guest caught her husband in a hotel room with another woman.

A man denies cheating on his girlfriend while he was away on a long trip; a woman demands to know whether her fiance slept with her sister; a guest fears that she has bad news for a family member.

A guest returns with two more men, certain that one of them must be her child's father; a man's mother says he must stop fooling around and take responsibility for the baby he helped to create; a 19-year-old brings three men to be paternity tested.

A guest says she has proof that her partner has been cheating; a man may be leading a secret, double sex-life; a guest denies paternity.

Paternity test results may ruin a friendship; a man says his baby's mother used to be a serial cheater; a guest says he cannot be the father of twins because they look biracial.

A teenage girl and her mother want to prove that a fellow teenager is the father of her baby, but he denies it; another teenage mother hopes a DNA test proves the paternity of her child.

A man claims that he is not cheating with his woman's best friend, but hidden cameras may tell a different story; in a previous appearance, a woman passed a lie-detector test after being accused of cheating, but now her man is in the hot seat.

Unforgettable guests return to update viewers on their situations.

Women have men take paternity tests to prove they fathered their children.

Guests learn the results of paternity tests.

Lie-detector tests gauge guests' fidelity to their girlfriends.

Guests learn the results of paternity tests.

A guest fears her older boyfriend is cheating, and her daughter reveals a secret; a woman wants to prove to her son that his wife is unfaithful and their children may not be his.

Guests learn the results of paternity tests.

Guests learn the results of paternity tests.

Lie-detector tests gauge guests' fidelity to their girlfriends.

Guests learn the results of paternity tests.

Guests whose children seem to have vanished into thin air look for anyone with information to help find them.

Guests learn the results of paternity tests.

A guest fears that her husband is making pornography with another woman; lie-detector tests gauge men's fidelity to their partners.

Guests are unable to keep their hands to themselves when faced with tempting situations, getting them in deep trouble with their partners.

Guests learn the results of paternity tests.

Problems come with May/December romances.

Guests learn the results of paternity tests.

Lie-detector tests gauge guests' fidelity to their partners.

Guests learn the results of paternity tests.

Guests display evidence that their men are cheating on them.

Viewers guess whether gorgeous winter beauties were born male or female.

A guest takes paternity tests to prove whether he is the father of both a newborn baby and a grown woman.

Marriages' futures depend upon the results of lie-detector tests.

Guests learn the results of paternity tests.

Lie-detector tests gauge guests' fidelity to their partners.

A guest may have cheated with her best friend's man; a woman accuses her son's girlfriend of infidelity; sisters fear that their babies have the same father.

Guests learn the results of paternity tests.

Ugly ducklings become beautiful swans.

Guests learn the results of paternity tests.

Guests learn the results of paternity tests.

Viewers can vote for singing, dancing children.

Three women say one man is the father of their babies.

She says she found him naked in bed with another woman, but he says that does not mean he was cheating on her; a woman makes her husband take a lie-detector test.

A guest wants to know whether her man is having a secret double sex life; a woman says she has heard that her baby's father has been unfaithful with more than 30 different women.

Guests accuse their men of cheating.

Women stuck in abusive relationships seek Maury's help.

A woman says there are two possible fathers of her baby: her boyfriend and his brother.

A woman regrets allowing her husband to have a threesome; a guest says her husband has been brainwashed into thinking their baby is not his; a woman accuses her partner of cheating.

Best friends say the same man fathered their babies; a woman's husband and boyfriend take paternity tests.

A third-time guest tries to find a man who does not cheat on her; a woman brings her boyfriend back to the show to have him tested again.

A woman has two brothers tested to see if either of them is the father of her baby; a guest's mother insists he is not a teen's baby's daddy; a man and his "secret girlfriend" say he is not the father of another woman's child.

Angry families say May-December relationships are inappropriate.

Unwed mothers make their exes take paternity tests.

Twins return to test a third potential father; a new mother is furious that a man and his wife are denying her baby; a 15-year-old wants to prove that an 18-year-old is the father of her child.

A guest fears that her man is having a secret relationship with her cousin; a lottery winner's girlfriend suspects he is trying his luck with other women; a bride-to-be thinks her fiance is cheating with several of her relatives.

Mothers of a teen and an infant demand that the same man take paternity tests; a man wants to know whether he is a baby's father or brother.

A woman believes her teen husband to be a cheater; a newlywed has found flirty texts between her husband and his female friend; a guest thinks her man is drawn to skinny women.

A returning guest continues the search for her child's father; a woman involved in a threesome wants to know which man is the father of her baby.

A lie-detector test may reveal a deep secret; two marriages hang in the balance.

Men deny they are the fathers of teen girls' babies.

Lie-detector results are in and the truth comes out.

Men deny being fathers and want nothing to do with the mothers and children.

Guests demand paternity tests.

Wives and girlfriends say they have stone-cold proof their men are unfaithful; a newlywed suspects that her husband is a prostitute.

A young mother wants to prove that her much-older partner is her babies' father; a woman who cheated fears her man may not be her baby's dad.

Family members argue over a baby's paternity; a woman and her boyfriend hope her ex-husband is not her children's biological father.

Hidden cameras catch guests' lovers making moves on other women.

Men who deny being fathers take paternity tests.

One man has a DNA showdown with three furious mothers.

A man learns that his girlfriend's baby may belong to his brother; a woman with a husband and a boyfriend wonders which is her baby's father.

Guests find themselves in trouble with their partners because they do not keep their hands to themselves when faced with tempting situations.

A man and his girlfriend don't believe he is the father of his ex's baby, and he takes a DNA test hoping to prove it.

Mothers seek help for their teen daughters who drink, use drugs or prostitute themselves.

Guests test their relationships by revealing secrets.

Women insist that their brother is not a child's father; a guest confesses to cheating on her boyfriend.

Lie-detector tests gauge guests' fidelity to their partners.

Zookeeper Jack Hanna brings animals.

Guests demand paternity tests and say men need to stand up and be responsible for their children.

Paternity tests clear up doubts and reveal the truth.

Lie-detector tests gauge guests' fidelity to their partners.

A man suspects that his children may be his half-siblings.

Lie-detector tests gauge guests' fidelity to their partners.

Tests solve paternity mysteries.

A bride-to-be suspects that her fiance had a wild threesome with her cousins; a woman who uses a wheelchair suspects that her husband is cheating on her.

A fiance, a friend with benefits, and an ex-boyfriend deny that they are babies' fathers.

A guest says she is so worried that her fiance is cheating on her with her best friend, Pooh, that she gained 100 pounds; a bride-to-be suspects that the groom-to-be has been sleeping with the maid of honor.

A mother makes her fifth appearance on the show to see if she can find out who her child's father is; after discovering some shocking secrets about his baby's mama, a man begins to deny paternity.

A woman fears that her boyfriend is living a double life; a man denies cheating on his fiancee with more than 20 women.

A guest wants to know whether he is the father or the uncle of his girlfriend's baby; a mother demands that her ex-boyfriend take a DNA test; a man refuses to believe that his son fathered a child.

Guests demand paternity tests.

A bride-to-be thinks her fiance is cheating with the baby sitter; a motivational speaker's wife thinks he has been sleeping with other women; past guests return with a secret to reveal.

Past guests who failed their lie-detector tests return to tell what happened after they went back to their normal lives and whether their relationships survived.

A returning guest's sister has a confession to make; a woman fears that her snowplow-driving fiance is a cheater.

A returning couple want to prove that he is not the father of another woman's baby; a guest who slept with two brothers wonders which is her child's father.

A man says a home DNA test indicated that he is not a baby's father; two women insist a guest is the father of four children; a cheater's wife fears he got their neighbor pregnant again.

A married woman's sister has a confession to make; a triplet's husband takes a lie-detector test.

Returning guests deny paternity; a man insists he is not the father of his wife's son or his ex-girlfriend's daughter.

Lie-detector tests gauge guests' fidelity to their partners.

A teen mother demands that her ex take a DNA test.

The wife of a man with three secret cell-phones demands he take a lie-detector test; a guest engaged to a married man fears he may be cheating with a third woman; a 33-year-old mom suspects her young boyfriend has been sleeping with her daughter.

A teen and her mother demand that a man take a paternity test; a woman involved in a threesome wonders whether her fiance or his best friend is the father of her baby.

A mother suspects that her twins may be only half-siblings; tests solve paternity mysteries.

Lie-detector tests gauge guests' fidelity to their partners.

Guests confront cheating partners.

Hidden cameras catch men making moves on other women.

Guests doubt their partners' fidelity.

Guests learn the results of paternity tests.

Maury uses decoys and hidden cameras to find out whether a guest's husband has been sleeping with her sister, who lives with them; a disabled woman fears that her fiance is already cheating on her.

A woman says she has evidence that her man is cheating; a couple survived a shooting, but she suspects he is cheating.

A woman caught her husband cheating, and the other woman claims he fathered her child; paternity discrepancies.

Guests are unable to keep their hands to themselves when faced with tempting situations and find themselves in trouble with their partners.

Guests learn the results of paternity tests.

An older woman fears that her husband, 19, is unfaithful; a guest says her husband is being brainwashed into thinking he is not their baby's father; a man says he got a bruise on his neck while playing basketball.

Tests solve paternity mysteries; a guest fears that her husband fathered another woman's child.

Lie-detector tests gauge men's fidelity to their partners.

A woman desperately searches for her biological father.

Lie-detector tests gauge loved ones' fidelity to their partners.

Guests learn the results of paternity tests.

Guests learn the results of paternity tests.

A woman fears that her boyfriend is leading a secret, double life; a returning guest has new issues.

Maury follows up with past guests to find out what has happened in their lives since the cameras stopped rolling.

Men who deny being fathers learn the results of paternity tests.

A sister's confession may destroy relationships; a guest accuses her fiance of cheating on her with more than 20 women.

Guests learn the results of paternity tests.

Guests learn the results of paternity tests.

Guests learn the results of paternity tests.

Women suspect that their fiances are cheating.

Paternity results could ruin a friendship forever; a teen mother has a woman's boyfriend take a DNA test.

A wheelchair-user fears that her husband is cheating; accusations within a wedding party.

A mother returns for more paternity tests; a man and his new girlfriend deny that he is the father of a teen's baby.

A returning guest tries to find a man who does not cheat on her; a woman believes that her fiance has been sleeping with several of her family members.

Polygraph tests gauge guests' fidelity to their partners.

Guests learn the results of paternity tests.

Maury follows up with past guests to find out how they have dealt with paternity, shocking truths and abusive relationships since the cameras stopped rolling.

A man denies that he is the father of his cheating girlfriend's baby; a woman thinks her partner has been sleeping with her mother.

Two women want to prove that one guest is the father of all four of their children; a guest says her man has become a crazy party boy who denies her child; a man and his new girlfriend confront his ex-girlfriend, who says he is her babies' father.

Polygraph tests gauge guests' fidelity to their partners.