So what's new?
The percentages don't sound so different from what I recall of my schooldays, 2 or 3 girls out of a co-ed class of 30 who had a bit of a reputation, and maybe some of it just boasting.
And they weren't the ones I particularly wanted to see naked.
Since most of this seems to come out of the USA, as a product of laws and law enforcers suffering from an excess of puritanical zeal, it's hard to know what to say. We seem to have acquired far too many of the same sorts of law in this country. This government did some good things back in the last century, but it has gone badly off the rails, in a mangled train wreck of unfinished reform, corruption, and ill-drafted legislation.
These days, JS could be on the Sex Offenders Register for the relatively minor things I know she did. As for what she claimed to have done, this lot might lock her up and throw away the key.
In the distant past, people like that were Sectioned under mental health laws. They were declared insane, and put away out of sight. And, eventually, we decided that was wrong. This is much the same misbehaviour, given a false significance with a new technology. I can see the reasons to discourage sexting, but the way we've extended the anti-possession child porn laws suggests that, to politicians, every hammer is a screwdriver.