'Adult Friend' Finder? Relationship? Hmmm, something not quite right about that. Have you tried lavalife? They've got different sections for different... requirements. I used it a lot in the past, found it very good.

Since you've got very clear specifications, you might be better off just booking a cheap Air Asia flight and having a holiday there - backpackers' hostels can be very cheap. I hear they have plenty of 'aussie gals' in Australia.