If they can consent to having sex with another child around their own age, then why not with an adult?
In answer I'll give a thought from a 36 year old on the issue of prostitution that I didn't consider when I was 18. I think of all women(people really), if you polled their opinions at age 36, as to whether or not the average 18 year old is likely to be maturely educated enough to deal fairly intellegently, and with sufficient basis in knowledge and experience, of life and death issues (such as those with the possible undesired/unintended consequence of the creation of a new life), I'd guess many would say- you know, even 18 year olds it's pretty sketchy as to how wise it is to act as if their consent is the same as what we mean in the ideal when we say 'fully informed consent'. And the same goes with the angle of the serious financial transactions of one's life. I.e. I, and I don't think I'm that unusual in this regard, consider myself to have been extremely naive about the fabric of the global economy at even the age of 18. All I'm really saying with this long winded comment is to take the next steps of your hypothetical journey into kids(or even naive young 'adults') consenting when there is significant $$ changing hands during the same event.
In necrophilic sex coercion is the default unless there was some manner of written contract that the deceased actually gave permission.
This is the real reason I bothered to reply. Kudos for make me laugh, at a scenario that my hypothetical ex-libertarian but still philosophizing mind hadn't ever considered.
Keep in mind that in order to stop child pornography completely, you're looking at having to stop such things as TOR. This is actually a nice new hot topic in The Netherlands due to an investigative reporter going on TOR, finding plenty of child porn traders, and busting a guy who actively sought out children to pretty much abuse.
Good for that guy getting the bad guy, but seriously this is hardly a new topic. This is just the pedophilia/privacy/anonymouscommunication/terrorism debate that has been squarely on the table in clear current TOR-level terms for a decade. What happened was the governments and cultures have seemed to just ignore it, with things like warrantless data dragnets and the USA PATRIOT Act, de-facto stating the global unwritten rules of the game. I.e. governments don't believe in citizens right to secure communications with the internet. Or that's how I see it.
If they are aware, however, then I very much believe they're participating in the crime by virtue of helping to sustain a market for the materials in question.
And this pretty much has to be dictated by law, and it is another of these elephants in the room that have at the same time both been ignored and acknowledged in some inexplicably orwellian way. I.e. the expectation of culpability for running an open 802.11b router connected to your home ISP. I.e. clearly you are not culpable for the content, unless you monitor and become aware of it. But we see the slashdot trickle of laws trying to outlaw that. I'm torn between thinking it's the undecided issue of our age, or if the infrastructural power structures in place just decided it long ago, and any public democratic debate is so obviously unenforceable against the wishes of the elite establishment, that the mainstream hasn't bothered to have the debate. Eh... But I quoted your point because, if the public debate was to happen, and to matter, that is a core decision point (and yes, I know about common carrier laws in the US, but just like journalistic laws, we are in an undefined place where overnight, each individual on the planet has nearly been empowered to be both a journalist and a common carrier, and thwarting that causes a lot of people with a lot of power, to keep their power longer).