The age of consent in Florida is 16, anyway, I think. That part I don't care.
Secretly using your office to sexually come on to much younger aides, on the other hand.
How nice of you to ignore the federal law written by one Mark Foley.
Actually, the only federal law I know of dealing with cybersex in federal statutes is this one:
The rest of the federal laws on the subject do apply to those under the age of 18, but generally require crossing state lines with the intent of actually having sex with a minor, which so far, the former Congressman hasn't been accused of doing (but I wouldn't be surprised if he did).