A recent study found that one in five children online is approached by a sexual predator, a predator who may try to set up a face-to-face meeting.

In a Dateline hidden camera investigation, correspondent Chris Hansen catches some of these men in the act.

'I gave up coffee for 14 days – and this is what happened' QUIZ: How often should you pee?

Teens who want sex chat room-59

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Meet in a public place and do not divulge your address.

Tell at least two people where you are going and when you could be expected back.

Within hours there were men literally lining up at our door.

The men who turned up in our investigation included a New York City firefighter and a man with a history of mental illness and a criminal record.

Preferably don't go at all - not unless you take at least two people with you. Call yourself Sex Bomb or Dreamstud and you are bound to attract the attention of sickos who cannot get their jollies in the normal social way – ask yourself why this is?

(Susan Erasmus, Health24, updated June 2010)(Picture: teen boy using laptop from Shutterstock) SEE: Smoking triples your risk of developing this disease Vaping leads to 'real' smoking by teens Smokers who are offered cash incentives are far more likely to give up cigarettes than those who are simply offered tips on how to quit, a study found." Eddie: "I just -- that's what I thought she wrote." Hansen: "Well do you want to see the transcripts." Eddie: "I'm sure you have it." None of the men had any idea our hidden cameras were going to expose them before a national audience.When we told them, most headed for the door, like Steve, the married man with children. time and time again." Hansen: I've read all the transcripts.On the net it is dangerous to believe everything people tell you. There are many oddballs out there – do you really want them on your doorstep? Most parents would not jump for joy at this increase in their phonebill. If a specific person harasses you online, swears at you or constantly makes disgusting suggestions, you can have them barred – every chat room usually has an ‘overseer’ who is contactable. Puffball will react with shock when she finds out you are in fact a scholar and not the psychiatrist you pretended to be.Or Wizard when he finds out you are not a married mother of three as you pretended. Many people have had to change their telephone numbers after being constantly harassed by some weirdo who phones them constantly in the middle of the night.Also, scroll to the bottom of the page for the software mentioned in the story and more resources.