I'm fascinated to know what started this alleged icq conversation.
Your question is if it is legal. It depends where the site is produced, the content of the site and if a guardians permission is needed, provided the model is not emancipated. If everything is done according to law, then of course it is legal.
There's even a chance that the girl is over 18, but marketed as a 17 year. And for the love of all things holy think of a different word besides 'pedophile.'
BTW. I call bullshit on this entire thread.
