Australia's porn industry began a court challenge to the country's film ratings on Thursday in a test case which family groups said could lead to explicit sex movies being sold openly in shops and petrol stations.
Pornographic movies can only be sold legally in two Australian territories, including the capital Canberra, and generated an estimated A$500 million ($393 million) last year, mainly through mail orders.
While it is legal to own or watch sexually-explicit movies at home anywhere in Australia, sales are banned in the country's six states.
Australia's censors rate films from G, which are open to anyone, to R for violent or disturbing films suitable only for adults, and X for sexually-explicit films with heavily restricted distribution.
Now pornography company AdultShop.com Limited has asked the Federal Court to overturn the X category used by censors, arguing community tastes had changed since standards were drafted in 1984.