[quote=@Lillian Thorne]
Since this site is hosted in the US, US rules would apply.  
[/quote]

According to US Law, the only possible violation that could be charged would be "sexting." Even text based depictions of child pornography isn't illegal in the US, as they are considered a "victimless crime." So the only fear would arise in actually RPing in an 18+ Roleplay with an underaged person, and that could most likely be argued away in court. All this is in addition to the fact that US Cyber Law isn't enforced in the slightest.