Common? Both aspies, both over 20 (ancient by WP standards), both single. That's 3 things anyone here can build on. As a male I've had GFs, but never officially dated myself. I didn't ship with a "how to date" program myself.
OP there are a lot of variables; you mention you're living in Sydney, I can reasonably estimate you've nobody local that you feel compatible with. What are your requirements, are you seeking a similarly aged aspie male in Sydney or are you willing to meet people from other countries? There's a lot of Q-and-A to find out if you and the other person feel an attraction, then if there is chemistry there who travels to visit who?
Conventionally what one does on WP to find a partner is post a bio on the Eligible Odd-Bods list. I haven't posted mine yet but it will probably say "must love junk food, and quaint musical equipment"
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Let's go on out and take a moped ride, and all your friends will thing your brain is fried, but you can't live your life too dirty, 'cause in the the end you're born to go 30