In PNG, pornography is subject to legal restraints to publication on grounds of obscenity. Child pornography also falls under the category of unprotected obscenity by these tests. Reubens ultimately pleaded guilty to a misdemeanor obscenity charge. This caused scandal and accusations of outrageous obscenity. Nudity and other forms of loosely defined "obscenity" are also banned. The concert subsequently sparked controversy following complaints of obscenity and suggestive content. Deodato was ultimately held on charges of obscenity and animal violence. See also under "Laws on obscenity and sexual content" above. He retaliated by banning the book from the US Mail on grounds of obscenity. These plays were full of obscenity, abuse, and insult. The list is intended to act as guidelines to help producers avoid obscenity lawsuits. In 1956 appeared his "Obscenity and the Law". The proceedings began with arguments from the defence regarding the obscenity charge. They were also successful as defendants in many obscenity cases. Similar difficulties in distinguishing between erotica and obscenity have been found in other legal systems.