That might be on the statute books, but that doesn’t mean it’s enforced. Game of Thrones would have been in a lot of trouble if it were.
Game of Thrones would not be an example as there are no depictions of people meant to be under the age of consent having sex since similar rules exist in most countries they would have wanted to sell the show into. Plus broadcasts, games, and pornography including printed material often have to be altered to meet with Australia's censorship legislation, it's always been and is still the most rigorously enforced in all the anglosphere. It's one area in which the idea of the easy going aussie roughness is a myth. As individuals they may not come off as uptight and as puritanical as their USA cousins, but in actuality via legislation there is a lot less freedom of expression in regard to violence and sexual content.