Simple but not. 3D erotic sites usually have stores or payzones. You need a bank to process credit cards. And if the bank is more restrictive than the law, you have no choice (or changing the bank and probably find a worse one). This is the matter because a lot of 3D sites don't allow child nudity including non-sexual contact pics. If you upload here a nude kid, you're acting against the private rules of this private site (and a private site can have rules more restrictive than laws - you have the choice of join or join not into the site, once you are in you need to follow the TOS

The sad thing is when a site has rules which change with the incoming of new laws (or politics, or moralism...). You could upload here a nude fairy with a child face; now not. Renderotica allowed rape and non-consensual pics; recently not. Erotic Illusions had a big restriction of members who posted violence pics. In all these site you can't upload a pic with bestiality althought you says ther aren't a sexual contact between a human being and an animal but a 3D image with 'no victims'. TOS is TOS, laws are laws, and the most of times TOS is very influenced by the bank which works with the site (the extremetely neomoralist Paypal for example)

Dura lex sed lex (hard law but is the law)  :(

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"Poser isn't a SOFTWARE... it's a RELIGION!"