But as the O'Kimosh case (and so many others I've encountered) illustrate, it's not only ad sites like Backpage and Craigslist, or explicitly adult-oriented sites, where Americans advertise, find one another, communicate, and arrange to meet for sexual activity that violates local, state, and federal laws.

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Instead, he's charged under lesser-used federal statutes related to sexual exploitation of children, obscenity, and immoral travel (the Mann Act)—offenses related to recent congressional bills on warrantless email snooping, police wiretapping, and online publishing, among other things.

A bill in the Senate expands the authorities' power to use wiretapping in cases that involve the Mann Act, obscenity, and sexting with a minor.

But it is a difficult time for both the parents and children.

In fact, parents who think they have the most adorable and obedient kids tend to change their tune when their offspring become teens.

"It raises a lot of questions about whether this is criminal behavior,” Cohen said.

And while the texts show Weiner was aware the girl was a high school student, Cohen said it legally doesn't matter if he knew she was 15 or not.

Anthony Weiner may have exposed himself to criminal charges and more child custody problems with his alleged inappropriate texting with a 15-year-old girl, legal experts told the Daily News. At least he dealt with adults before this,” former prosecutor turned celebrity lawyer Raoul Felder said of the 52-year-old Weiner’s online relationship with a 15-year-old North Carolina girl.

"Now you're in the ‘Oh my God’ area." "I would think it's time for some kind of police action," Felder said.

So what changes when children enter their adolescent years? They go through significant physical and hormonal changes, leaving them confused.