For everyone in this thread who's not Australian, Atkinson is one State's Attorney General, he's not a federal politician. The problem is for the R18+ rating to be implemented, it needs the approval of the Attorney General of each state, which he is refusing to give, all the others have indicated they are in favour of better classification along the lines of movies.
Also, Australian democracy is not voluntary, everyone who doesn't want to be fined, votes, so if the majority of the people who don't care either way normally in his constituency decide to vote against him in the next election, he loses office. Unfortunately, he has a very big majority in that seat, but he's been irritating enough and his government federally and stateside has been ineffective enough that there is a chance of him being unelected. Also, his party has been reliant on the younger demographic voting for them and I would advise anyone in the South Australian seat of Croydon to vote for someone other than him.
Interestingly, his Wikipedia page has references to the major scandals he's been involved in through the link at the bottom.