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the cool passing wave of ignorance they say the heart is a lonely hunter and the hardbox ♪ captions by vitac onpan alarming number s and now girls could be just a click away from addiction.a a affect your brain as much as drugs and alcohol and a new generatigeneration of kids hav access to it than ever. a likely duo. the day that ended camelot. we sit down. the ban on portable electronic devices lifted.

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i want you to keep me doing this for another sixty years. at kaiser permanente, we want you to choose the doctor that's right for you. find your perfect match at kp.org and thrive. from new york city, nz "nightline" with dan abrams. that's correct for joining us. 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 thi 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. i'll never forget it. >> reporter: not surprising these images often color teens ideas of what sex should be

like. caleb is a young man from england with a long-time porn compulsion and he grew up with english journalist saying he's had sex with women and it just doesn't compare. >> it's not as good because they're not as good as the porn. the porn goes into a lot more. >> reporter: and with pornography so ever-present, some teens become addicted to it. sometimes, at heartbreakingly young ages. >> from 12 to 13, all the way up to 14, it was kind of there, uninterrupted. i became almost numb to it. it became such a part of my, pretty much which daily routine. >> reporter: nathan, a teen in utah, eventually admitted to what was going on to his parent tsz and was ultimately able to quit but for others it's not that easy. >> i startsed to isolate myself because i hated what i was doing. i hated that i couldn't stop. >> reporter: breeian is now 23 but remembers how strong her addiction was during all of her

high school years. >> i would say that this is something that was not just me. i knew tons of students who were in my grade, my peers, who were doing the same thing. >> reporter: far caleb he said it crept up on him. >> at first i didn't know the limits and the bounds of what was extreme. so with friends and i'd find out how much they view porn. and it just didn't compare. like every day i was watching porn. >> reporter: we spent a day with him to see the problem first hand. >> why do you think you have this relationship with porn? >> i don't know. it just seemed -- it was just something that my brain must have picked up. i can't find a way to stop. i tried getting rid of my smartphone. >> how do you get over that low? >> reporter: he gets a glimpse of his hard-fought struggle when they drive past a pretty girl

and it immediately triggers a reaction. >> just going to go for a look. >> there he goes. >> better? >> yeah. >> so annoying afterwards. >> how do you feel now? >> pissed off. >> why? >> for that split second, i just feel like the best thing to do and as soon as i've finished i'm like why the [ bleep ] did i just do that. >> that sounds like a drug addiction. >> it is, virtually. i can't stop it. >> reporter: but if the internet porn compulsion the same thing as a true clinical addiction? does it actually change a person's brain? this doctor, a nur ro neuropsyc working at cambridge university

tried to find out. >> i wasn't sure what i would find but in part because we know so little about this. >> in these images you can see the pleasure centers of an addict's brain responding to their drug of choice. with scans of young people with a porn compulsion show the same result. she found 20 young men between the ages of 19 and 34 whose lives were so controlled by porn they were willing to be a part of the study. they didn't want to be identified but they were willing to be scanned and compared to a control group of volunteers. the subjects were shown images of explicit porn to see if their reward centers would respond in the same way as drug users. when the data was analyzed the results were astounding. >> we see a very clear increase in activity in the reward center. >> reporter: the compulsive user's reactions were twice as active as those in the control group in the pleasure center, known as the striatum, matching the responses of drug and alcohol addicts. >> compulsive pornography users

have parallels with substance abuse disorder. >> reporter: one study is not definitive and the frayed group for the porn industry says unlike drugs and alcohol, adult content is not and cannot be a chemical addiction no more than compulsive shopping, gaming or hoard. but even if we assume it's an addiction what's the cure? a former ad exec turned entrepreneur think she has a solution. replace hard-core online porn with images of real love-making. she started a website calmed "make not porn" a kind of youtube video streaming channel online where real life couples give office a peek beneat their sheets. the site went public in january and already has more than 100,000 users. >> children are viewing hard-core porn years and years and years before they'll have their own sexual experience and it's shaken their view of what sex is. that's why what we're doing is

so important. >> reporter: other producers like this director are making what they say are softer, more relatable depictions of sex. >> porn is a fantasy. and it can't ever stand in as sex education. >> reporter: but for the kid who is view these hard-core images, they can be difficult to erase from the brain. for this girl, these pictures that many kids so too many of too soon, simply don't translate to true life or true love. >> parents are able to talk to their children about what real love and real sex later on is. most of the kids i know would trust our parents over two porn stars that we've never met. >> for "nightline" i'm lindsay davis in new york. >> what do you think? do parents need to update their sex talks to include porn? tweet us at nightline. next, the killing of jfk has brought to life by rob lowe and

bill o'reilly. we sat down with the unlikely duo. [ alarm sound for malfunctioning printer ] [ male announcer ] you've reached the age where you've learned a thing or two. [ metal clanks ]

♪ this is the age of knowing what you're made of. so why let erectile dysfunction get in your way? [ gears whirring ] talk to your doctor about viagra. 20 million men already have. ask your doctor if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain; it may cause an unsafe drop in blood pressure. side effects include headache, flushing, upset stomach, and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. [ cellphone beeps ] this is the age of taking action. viagra. talk to your doctor.

just when you thought you might have heard everything about the life and death of john kennedy, a new film about the assassination which pairs up actor rob lowe with talk show host and author bill o'reilly brings a legend to life in a whole new way. abc sat down with the unlikely duo to discuss their vision in this new look at camelot. >> reporter: a man lifts a rifle

and fires. three shots. three shots at the heart of a new movie "killing kennedy" about the collision course wean an assassin and a president. a story we have been telling ourselves over and over and over again ever since it happened for re real, 50 years ago next month. a landmark anniversary for those telling the story again now. who include some interesting pairings like this guy, who wrote a bestseller called "killing kennedy." >> i remember sitting in a theology class in long island and having a loud speaker crackle and the principal go -- the president's been shot in dallas. my head snapped back. >> reporter: and this guy who stars in the movie, based on the bestseller. >> it started with joe. if shakespeare were alive today he would have written about the kennedy family and jfq would have been a particular character

and actors would play him as a rite of passage. >> reporter: not just this movie but others like "heartland" which focuses on the hospital where staff tried but failed to save the president's life. shelves of books to mark the half century, a half-century obsession can we call it. >> and this thing still grabs us why is that? >> when he was killed his image was frozen in time. his good-looking robust man with a beautiful wife and a lovely family. when you had a tragedy like that, and a blunt force on a country, the image that stays is the image that people will always remember. >> reporter: but how do you make fresh a story that's known so well? >> i john fitzgerald kennedy do solemnly swear. >> reporter: or if you're an actor playing kennedy how do you live up to an image so burned

into public memory? >> ask not what your country can do for you? >> you have to look like him. you have to have the voice. you have to have the mannerisms. that in and of itself is a challenge. >> we don't know what lincoln or adams looked like or moved like but ken si is on so much film do you need to do an imitation or fill it somehow? >> an actor's job isn't to imitate. make the character recognizable as a human being. >> i am today, announcing my candidacy for the presidency of the united states. >> what i want to know is did the voice get stuck in your head? >> the voice that gets stuck in your head is the famous voice of "ask not" that's his. [ terrible voice. i spent more time listening to his dictation. his private dictation. >> reporter: "killing kennedy" strives to be a record of what happens during his thousand days

in office. from the agony of the "bay of pigs" debacle -- >> i was too soft on communism and i told them i was ready. >> reporter: to the pink suit especially picked out to the day in dallas. >> oh, my favorite. >> i know. >> reporter: and even a nod to kennedy's obsession with abraham lincoln. >> tonight is the night i should go to the theater. >> reporter: all images from a legacy that began to be shaped in particular, by jackie kennedy almost immediately after her husband's death. >> kennedy was the ultimate figure on which we projected all of our hopes and aspirations. he was so forward-thinking and so optimistic and so inspirational to us collectively, that when he went, we lost that. >> reporter: how much of the

story could be post humous mismaking, really? >> we know for a fact that his legacy is very carefully maintained, you know? and managed. i don't think that's a bad thing. that's as we would all want for anybody in our family. >> reporter: despite some 40,000 books that reported of jfk in the past 50 years, new nuggets of information continue to surface like the recently released audiotapes from an interview jackie gave to a author four months of the assassination. >> after the cuban missile crisis, he said -- if anyone is ever going to shoot me this should be the day that they should do it. >> reporter: nuggets that could be startingly personal. >> he played records sometimes. >> once there was a pleasing whisk of glory -- oh camelot.

>> reporter: it was not just what the kennedy family wanted us to believe had been lost, it was apparently what many alive at the time also wanted to believe. >> we need people to believe and people believe in jfk. >> reporter: and the amazing thing is how long it has lasted. even for people who were not there or too young to remember, like the actor playing jfk. >> i think generations divide between those that feel tingles still when they see the picture and those that don't because it was black and white faded photograph from far away. which group are you in? >> i wasn't born. i was born short live after he was assassinated but i'm absolutely in the tingle group. >> reporter: which is why the story of that day still gets told. and why it's still felt by many what happened 50 years ago, as though it happened yesterday. for "nightline" from washington. >> "killing kennedy" premieres sunday on november 10th on the

national geographic channel. next, the answer jeopardy's alex trebek. the question? who is helping one airline make a much more interesting flight safety video? cedes-benz once wrote something on a sheet of paper and placed it in his factory for all to see. ♪ four simple words where the meaning has never been lost. the challenge always accepted. and the calling forever answered. ♪ introducing the all-new 2014 s-class. mercedes-benz. the best or nothing. introducing the all-new 2014 s-class. help the gulf when we made recover and learn the gulf, bp from what happened so we could be a better, safer energy company. i can tell you - safety is at the heart of everything we do. we've added cutting-edge technology, like a new deepwater well cap and a state-of-the-art monitoring center, where experts watch over all drilling activity twenty-four-seven.

and we're sharing what we've learned, so we can all produce energy more safely. our commitment has never been stronger.

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using for take-off devices during take-offs and landing. airlines have to that their airlines can tolerate the radio interference but good news, the faa says most already do. but they'll still be required to pay attention to in-flight safety instructions and it would be a lot easier if all airlines did something like this. ♪ the video from virgin america upped the production value by bringing two choreographers and a hollywood movie director.

♪ they're now seek egg fing perfo for the next round of safety performer so you can sing in the next round of mile my club. they may have to rewrite some of it. >> ensure your mobile phone and electronic devices are turned off and stowed. >> but not all of it. yes, that is alex trebek and also featured, santa, elves an apparent reindeer and the abominable snowman. no word on whether santa applies these safety measures when piloting his own reindeer. we'll presume he does. thanks for watching abc news. see you in the morning on "good morning america. and as always, we're on the web at abcnews.com. good night!