From the reddinternetofthings..
"Dongguan is an Asian term for an upgrade from basic services and includes a longer session of pleasure with Nuru, rimming, etc. It's named for a city in China that is a known red light district."
"Years back I found an article describing the many “steps” in full Donnguan style and damn it was insane how the woman takes care of her man in that style. To date, never found anything close to that here. To me, Donnguan style is a money grab. If any girl actually did everything as described, it would be a 3 hour event with bathing, eating small amounts of food, lots of kissing, oral, massaging, licking. Total lust filled time."
"NSFW Story
I went to one of massage places in China on my business trip, when you enter girls would get in line (there were more than 20 of them) and you could choose anyone you liked. After that the girl would accompany you to your room and get prepared. Then you receive nuru massage, I also got fingered a little bit, while getting bathed it is a normal practice for the procedure. On the bed there was that set up with metal tube and robes, she gets on top and hang upside down. I had no idea what was going on, she took off my trousers and started giving me blowjob while hanging upside down. Then she started spinning clockwise and anticlockwise with dick in her mouth. I came extremely fast. Then vanilla sex took place, I tried to explain to her that I wanted that trick again but I don't know chinese."
Search: Wind and Fire Wheel technique.. I think they also deploy hot and cold effects on yer dick during this event and those leading up to it. Definitely non-existent here.. best you can hope for is a mouthwash blowjob and a cool breeze afterwards. (I'm willing to be corrected on this. If anyone has better intel, please don't keep it to yourself!)
Sounds like the Dongguan region became very competitive and the game was ratcheted waaay up.. and this entire phenomena would be a great reason to travel there.. but do not expect anything like this performed here. They use the term because of the reputation, but are completely counting on you not knowing what it actually is. So unless they put it in writing and you see a well anchored set of suspension gear on the ceiling, you'd just be paying a premium for disappointment.