I worked in China for a couple of years and during a visit to Hong Kong I caught this local doco about Prostitution in HK.
The doco team (all local) interviewed a variety of girls (and one guy), Madams, Police Officers and punters.
They collectively divided HK girls into four categories :
High end Internationals - who jetted into and out of HK from Aus, NZ, Canada, UK, and who charged huge amounts - mostly only affordable for corporate entertainment $10,000Au per evening (5.00pm to about 11.00pm, sex but not overnight).
Internationals - as above, but around $1,000Au to $3,000Au for a couple of hours.
Locals - who charged around $100Au to $400Au for an hour.
Trafficked - whose handlers (Snakeheads) charged $40Au to $100Au an hour.
The take away I took note of was that the way the doco crew worked out who was local and who was trafficked (before they did their research) was mostly by the girls' attitudes and behaviour.
Local girls generally tended to be happy, confident, chatty girls who sometimes didn't show up for a shift or failed to answer their phones.
Trafficked girls tended to be nervous, unhappy, surly girls who never had a day off and avoided talking. They were always afraid because the Snakeheads usually had some hold over them - harm to their parents in rural China was the most common, or being 'Outed' which meant deep shame and possibly never finding a husband, etc.
They were brought to HK to work in restaurants or in shops, etc., but immediately had their passports/ ID cards/ etc confiscated and locked in 'Houses' and told to get out, they needed to pay back the cost of getting them there, food, accommodation, etc., and if they didn't pay, their parents would be hurt, etc.
They wont talk to you, are not interested in being 'saved', etc., because of the consequences back home.
Put me right off punting for quite a while.
But I did look for happy, confident girls who sometimes told me they wouldn't be available on a specific date because they were off to a friend's house for a holiday or decided to go shopping, ....
I don't know about the scene in Melbourne, but all the Chinese girls I have seen here in Perth so far seem to fit the Happy, confident, working to a plan to go home and buy a shop mold.
Fingers crossed.