Sadly, Thai women can be in the target zone for Aus Immigration.
I copped the heavy 3rd degree when I landed Darwin 5 years back with wifey on 3 month tourist visa.
2 mates, married long time to Thai girls, took them to Aus.
Within a year they vanished, perhaps/likely together. They could not get out of party mode.
I don't ask questions so I get told no lies.????????