What goes on in PM's stays in PM's.
But seriously, I don't believe cybering is a problem. On the internet in general, even over instant messengers, 'sexy texting', or phone sex, if that counts as cybering. (?)
In PM's I don't think it's an issue. But on Gaia..? Maybe in your own gaia home, but even then. Out in towns? lol Usually trolls.
Most [if not, the majority] participating here are underage. However, in a semi anonymous internet setting just about anything goes, as far as lying about your identity. Although now that I'm nearly 20 I make it a point of figuring out how old someone is before getting into anything too deep. [It's usually pretty indicative though, by typing skills and command of correct spelling andor grammar the general age group.]
Toxic has a lot of valid and well thought out points. It's true that children shouldn't be exposed to 'indecent' [which I'm going to leave vague] sex acts online.