It’s been a while, but the last time I checked, Australian censorship laws primarily limit works which can be sold in Australia. I believe that it’s explicitly legal for adults to own anything that doesn’t break any other laws (including decency and pornography laws, but those are surprisingly not terrible IMO), provided they they don’t buy it in Australia.

There are also some laws about using the postal service to transmit classified works, but I think they’re less restrictive; for decades there was a thriving mail-order pornography trade based in the ACT (which had more relaxed censorship than the other states).