Dongguan is just a selling point, imo. Like how everything in the grocery store says "Organic" to think you're getting the best quality healthy food.
Dongguan City is a China's sex capital; like Las Vegas or Amsterdam's Red Light districts. So your take away should be that any provider that knows Dongguan-style services is trained in the super secret ancient ways of "whore-fu".... but it's more like 20 step scripted program that starts like the usual AMP service, make out session in a shower, full-body massage, body-slide, cat-bath, rimming, oral until CIM, more massage and teasing until you're re-hard and recharged, then the main event; in short, it's basically a 1+ hour PSE session with all the fixin's......at least it's supposed to be, in theory.