Why do you go on the internet and lie mate? I'm in Perth quite often pop over to radelaide for a frog cake at smoko. I would recommend anyone after a nice walk just give it a crack, it's like 15mins max. I think they put in a bike path recently too.
In Australia to have one you are supposed to have an RPZD fitted and annual inspections by a licensed plumber which isn't cheap. But you can go down to bunnings and get a hand spray with a t piece that comes off the stop cock for your toilet. But a plumber won't install it for you.
It's to do with not having shit go back into the water system. There's also some worry about the hand sprays falling in the bowl and causing bacterial growth. This may all be different in other states though. They exist here but they aren't common.
Emu war was on the other side of the country.