I'd like to highlight two things from that article...
Australia is the only developed country without an R18+ classification for games, meaning any titles that do not meet the MA15+ standard - such as those with excessive violence or sexual content - are simply banned from sale by the Classification Board, unless they are modified to remove the offending content.
This means that even Australians who are aged above 15 and want to obtain the adult-level games online will be unable to do so. It will undoubtedly raise the ire of gamers, the average age of which is 30 in Australia, according to research commissioned by the Interactive Entertainment Association of Australia.
Why the hell doesn't the government just introduce a rating system that's already in place for film literature?