Video Transcript. Transcript for The Teenage Brain on Porn. When we hear about celebrities claims to be addicted to sex there's a collective eye roll.

When it comes to porn, there's increasingly concrete evidence, science, that the addiction can be real. And as powerful as drugs and alcohol.

For many kids that can easily access porn from their computers and smartphones it can go well beyond just a dirty habit and become a dangerous one.

Here's abc lindsay davis. Reporter: According to one study, 7 of 10 teens have accidentally stumbled across porn online. But experts are asking is the average teen really ready for this?

Hard-core porn. Right on my phone for anybody to access. Reporter: We also suspected porn can't be good for the teenage brain but tonight a new study.

Is there now scientific evidence to back that up? When you put porn into google, what does he think is going to come up?

Probably pictures of make a naked woman. He's account putted into a woman of sexual violence. Reporter: Gail, the author of a book called "pornland" says for this the average teenage boy porn is his first formative impression of sex.

He doesn't have a reservoir of his own experience of sexuality with other people. He's probably never had sex with another human being.

Reporter: And not just boys. This girl was only 12 years old when she shockingly admitted she's not only seen porn but she understood all the innuendo.

It says if you dress this way you'll be treated well or you'll be powerful. Sex is powerful. Reporter: Wshe's part of this new order of teens showing that exapproximately sit images can be found anywhere.

There's no one before us. We're the first to have what we have and there's no one before us to guide us. We are the pioneers. Reporter: And these images can be traumatic.

Her friend, danielle, first learned about sex on a porn site. One black guy and what spannic guy and this blond woman and they were ferociously banging each other.

It was very -- I mean, I came home and I was balling my eyes out. Britney officially became a woman in this iconic Brit-tease.

Celebrating the often-overlooked underboob, Christina showed us that her voice wasn't the only thing that could reach impressive heights. What goes best with washboard abs?

Literally anything or nothing No shirts were no problem for this pair of jack asses, who showed that sometimes dressing up just means abstaining from stapling one's self for the evening.

Jason Derulo talked dirty to us before he even opened his mouth. Naked as the day Gaga was born this way. Just because they're called underwear doesn't mean Selena has to wear anything over them.

He says he has been doing this three years but unlike other agents said he actually cares about his girls. He didn't give you time to think it through.

I think that was a good strategy for him because if I would have had time to think it through I probably wouldn't have gone. It looks innocent and all.

Reporter: She chooses a porn name ava Taylor and takes the irreversible step on a website called reality kings. Too much. I was freaking out.

That's it. What's up ava? Nothing, just chillin'. At first reveling in her newfound freedom. I have done so much here.

Penthouse, lamborghinis, did all the I ever wanted to do. I'm trying to be famous. You have to do what you have to do. Reporter: The money comes at a price.

The girls pay for rent, lingerie and makeup. Most girls shelf life is a few months. Rachel lasted six. You are really just surviving.

What does the agent take? Reporter: Also the physical toll. It is horrible because no one is meant to have sex that long or that vigorously, or you know, that intensely for that many days in a row and with different people.

A lot of porn is like that. You are like this is so just work right now. Watching it from this point of view now, I can just tell that I really didn't want to be there.

I was like mad during this. I can see it on my face. Reporter: The real winners, the porn sites, which get more traffic each month than netflix, Amazon and Twitter combined.

These banner ads just pop up for these websites called 18 and abused. Matthew would be forced to register as a sex offender everywhere he lived, for the rest of his life.

To go to church I have to have written consent from our priest, I have to sit in a different pew, one that doesn't have a child sitting in it.

The judge couldn't believe the prosecution was insisting on sex offender status and invited Matthew to appeal. A message arrived from the judge, ironically on the computer, informing them that Matthew would not be labeled a sex offender.

Matt and his parents had won his life back. In the den of the Bandy home sits the family computer, now unplugged from the Internet. The Bandys learned that, for them, the Web is simply too dangerous.

Under even under the strictest rules and the strictest security, your computer is vulnerable. Shows Good Morning America. World News Tonight.

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