if you want to seek for a sexual trade in China right now, you still realize this thought. it is forbid apparently, but there still exists prostitution acivity and trade in darkness, I do believe the authority open eye and close one eye over this case. as you known it is not neccessary to be clarified more details.
I agree that the more the government ban something, the more tempting it appears to be. Except for a small portion of old but still energetic men seeking for young women to satisfy his sexual desire, many people are invited by the secretness and excitement offered in a sexual transaction.
I'm all in favour of decriminalising prostution but not legalising it. Make sex workers undergo mandatory registration along with DNA and finger printing for example, issue an special workers ID card and make STD testing mandatory and weekly in nature.
Teach them about safe sex and the dangers of STD's. Outlaw fishbowls and prostitution in KTV joints etc. Make it mandatory that a girl reveal to any prospective husband or non client that she has worked as a prostitute.
In order to stop fiddling with the blood tests have them performed by pathologists who are not Chinese and who can't be bribed.
Sounds pretty good doesn't it?
Now for the teeth in the tiger. Make frequenting prostitutes a crime, mandatory public humiliation (loss of face) via photo and address of offenders in the local newspaper, big fines for first time offenders and mandatory prison time for second and subsequent convictions. Give the courts no leeway in the matter of fines and prison terms.
This is very similar to how they deal with the problem in Sweden, by targeting the "john" not the working girl and it works extremely well.