If you want to see the film Viva Erotica be grateful for federalism. The Sydney Morning Herald puts the situation this way:
AS SEX films go, Viva Erotica is tame: 28 minutes of sex and no violence. But because the sex is real, it is classified X18+, a rating that means it is banned from sale in all states.
All states, yes. But not all territories. Our-not-quite-so-conservative-as-it-seems federal government has declined to use its power to over-ride territory laws permitting the sale of X-rated videos or to instruct its wholly-owned corporation Australia Post not to deliver them around the country. But porn peddler Adultshop is seeking to overturn the X classification of Viva Erotica on the grounds that it does not offend ‘community standards’. After all, R-rated real sex is currently showing at your local art house cinema in Shortbus. But under the Office of Film and Literature Classification guidelines (pdf) Shortbus‘s real sex is not the same as Viva Erotica‘s real sex because the former has bothered with a plot and the latter has not.
To help its case, Adultshop had ACNielsen conduct a survey.
Explicit erotic films: Films and videos primarily involving various forms of actual sex, including close-ups, involving consenting adults, with no coercion or violence. In the ACNielsen survey, Australian Adults were asked: Do you personally find this content offensive (ie does it cause feelings of outrage and/or disgust)?