In Bangkok Its all depends on how much time you have, and your hotel location, as it might be easier to call an escort agency and pay the premium, and get the girl delivered to the hotel especially if you are staying at an Airport Hotel,
The alternative is jump into a taxi or Grab (Uber) and go to Nana buy some Kamagra (viagra) and a few a souvenirs and a bite to eat, as shops are open late, than go to a soapy massage parlour do your business there, and than go back to your hotel, you can sleep on the 9 hour flight back home to Sydney