one thing that would be difficult to ascertain is 'did the person make the cartoons with the intention of arousing someones Libido', or did they simply produce them with intent on making money, because that seems to be what the public wants.

Good point but unlikely to hold up in court. If the material is not sexually arousing for them, the buyers wouldn't want it. It follows, then, that in order to sell it, it has to be made with the intent of arousing the reader.