Hi
although i am living in Turkey i can answer your questions
First of all australia is a good choice(what i heard from my friends)
You cant host porn in australia host means your server cant be in Australia but you can rent or colocate in other countries.
Internet connection is not too slow not good as like in States
More important thing
What i know in australia you billed by in not out
what this means
For example when you rent a server in states you billed for out
you will have a 1mbit means 300gb out and 40-50 gb in generally
in australia you will be billed for that 40 50 gb and 1gb bandwith will cost you 30 40$ they donot have cogent or yipes
