I know of at least one producer (not counting the deceased Bryan Kocis) who is fairly open about the fact that he trolls Myspace for 16 and 17 year old boys and basically chats them up and essentially "grooms" them so that literally as soon as they turn 18, he's got them on a plane and shooting content for him.

Illegal as hell, and wildly unethical, but nobody seems to want to do anything about it.

Honestly, with any sort of online recruiting, the very first question should be to ask if the person is really 18 or not, and if not, to simply not communicate about anything even remotely associated with sex, adult content, or anything of the sort.

With our first-time fly-in models, we use a pretty detailed contract, the first part of which has language to the effect that if they have misrepresented their age, Armageddon will occur and all hell will break loose and they will be very, very unhappy that they've lied. Once or twice, after the contract was sent, the model stopped responding, and I have always wondered if it was because they were underage and got scared. But between that and the other age verification methods we use, we're confident that by the time a model shows up, they are of legal age.