Basically, yes, you can break the law by viewing pornography - if the pornography viewed is illegal in the country you are viewing it in.
If, however, the pornography is legal in the country in which it is viewed, the viewing of it on the internet is also legal.
Viewing something over the internet is considered "publishing" because when you access it, a copy of it loads onto your computer whether your save it or not. So ... if you could legally go to the shop and buy the pornography you are viewing you have no problem and have broken no laws. If you cannot purchase it in a shop because it is prohibited, you break the law.
I hope that makes sense?
There are no disclaimers on the sites other than to say that they contain adult content. Most pornography that is illegal does not have a big sign saying so. I guess the assumption is that people over the age of consent, who are able to view this content do so having a basic understanding of what is, and isn't, legal in the country in which they live.
Ignorance of the law in regard to prohibited sexual content is no defence - otherwise people would just say "well, I didnt know that" in court and expect to get off.
If you are wanting to advise people, I suggest you send them to http://www.netalert.gov.au/advice/legal/australian_law/what_are_the_specific_laws_in_relation_to_internet_pornography_in_australia.html
This is a government site which fully explains pornography and the internet. It is a bit difficult to navigate, but unfortunately there is no "this is legal and this is not" simple list I can refer you to.
You are most welcome,
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).