HK guys have been doing it regularly in Shenzhen and Dongguan for years already.
Two HK guys were my students in Shenzhen during my first year in China.

They both regularly dated and paid mainland girls for sex, one was even stupid enough to have unprotected sex with prostitutes.

Dongguan apparently has the biggest brothel in Asia, not been to inspect though.

Had mates that suggested going to Dongguan for brothel touring weekends, but it didn't really appeal to me. I know that if you was in Amsterdam, Soho in London, Las Vegas (or is just the rest of Nevada?) or anywhere in Germany/Austria, you would be tempted to try getting a classy whore because it is out there and legit/tolerated, but Dongguan... I know that guys who come for the Canton Fair often stay in Changping in Dongguan rather than Guangzhou, but it all just sounds like a larger version of any back street in China.

Not to mention that most of the girls come from the skankiest disease ridden places in Hunan, Henan, some are desperate for cash or abducted etc. I'm not really a hooker banging person but if I was to get one, I'd prefer my whores to be a little more free-range, if you get what I'm saying? I don't want to feel like I am practically raping somebody and then also paying for the privilege at the same time. There has just got to be a fair amount of human trafficking or migration out of desperation to Changping and I don't feel comfortable with the idea of supporting it with my patronage.

However, although I say that I'm not a fan of hookers, I must admit that I would love to go to one of those 'soapland' places that you see on pornos in Japan. I know that you've got to pay for it, but do you honestly believe that you could easily persuade your girlfriend to mess around with inflating the air-bed, buying the nuru gel, getting 38GG breast implants etc? I already have a tricky time trying to persuade a girl that I'm currently dating to try simpler things, lol.