Though Australia recently added an adult-oriented R18+ rating to their game rating system, Player Attack reports that Saints Row IV has nevertheless been refused classification in the terrirory, being deemed too much for delicate Aussie sensibilities. This means, pending a potential appeal, while it will be legal to own, it will not be permitted to publicly sell or display the next installment in Volition's open-world action series. The site cites how the game violates the R18+ specification, as games are not to "depict, express or otherwise deal with matters of sex, drug misuse or addiction, crime, cruelty, violence or revolting or abhorrent phenomena in such a way that they offend against the standards of morality, decency and propriety generally accepted by reasonable adults to the extent that they should not be classified." Here are the specifics of how Saints Row IV runs afoul of this:

In the Board’s opinion, Saints Row IV, includes interactive, visual depictions of implied sexual violence which are not justified by context. In addition, the game includes elements of illicit or proscribed drug use related to incentives or rewards. Such depictions are prohibited by the computer games guidelines.