"More than 20 percent of teenage girls are estimated to have sent out nude or semi-nude photos of themselves, which I found shocking," Rachael says. "That's almost 3 million teens!" These actions can have terrifying consequences for both the teens and their families, because something that may seem as harmless as sending an e-mail or text message can be punishable under child pornography laws. Rachael turns to HLN anchor and legal analyst Nancy Grace for the guidance every parent needs about teens and "sexting."

Nancy first heard of "sexting" when she started covering cases involving teens who were finding themselves in trouble for sending around revealing photos of themselves or their friends. "They do not realize that they can end up in jail. They can end up with felony charges," warns Nancy, who is a mother of twin toddlers.

In one case, Phillip had just turned 18 when he sent a mass e-mail using his ex-girlfriend's e-mail account that would drastically change his future. "I did something because I was upset, a very very immature, teenager thing to do," he says, explaining that he sent nude photos of the 16-year-old to everyone in her address book, including her friends, teachers, parents and grandparents. "That brief moment in time has legal consequences," Nancy says, explaining the photos are considered child pornography. Phillip was arrested, and eventually convicted. "I am a registered sex offender," he says. "I cannot leave the county, I have been kicked out of college, I cannot visit my family, I cannot live with my father because he lives too close to a school. I'm not allowed to go to the Internet; I cannot find a job. I have to take a weekly class with other registered sex offenders and sexual predators who have done some pretty bad stuff, and I'm now placed in a group with those people ... I've lost so much because of it, I want to say that I am sorry."

Rachael praises Phillip for having the courage to speak so openly about his crime, and the now-19-year-old explains why he's chosen to share his story. "Other kids need to know that this is not something that they should be doing ... their life could change and it will be ruined because of it," he says.

Nancy says teenagers must also realize these e-mails can potentially put the recipient at risk, as they could face criminal charges for their involvement. "The law typically has to show that you have some intent to know what you're opening," she says, while adding in some cases parents can also be culpable. "That's very tricky," Nancy says. "There's a case right now where some teens created a Facebook community and on that community they basically trashed another teen saying she had AIDS, that she was a slut ... now there's a lawsuit not only against the teens but their families for not supervising them correctly."

So what can parents do? "Do everything you can to watch your kids when they are on computers," Nancy advises. She suggests placing controls on their cell phones and computers to help kids make the right choices when they use technology, and reminds parents how much supervision is required when kids go online. "Would you leave your kid alone, unsupervised, with somebody you don't know? That's what you do when you leave them alone unsupervised with the Internet.