Have you ever wondered why there is so much violence in Kundu?
China also has had a 2nd wife culture for millennia. It is a status symbol here, for the man. Also, there are a lot of girls, not all of them nice, who have figured that they can earn more in a night than they can in a month at a regular job. And often they don't need to do more than flirt and have men buy them drinks and maybe give a cash tip for being nice. Or sometimes more, but not always.
There is also the phenomena of girls paying their way through college by having a sugar daddy. None of this is new.

There are usually these on sale in the big shopping malls.

Shanghai food is a bit disapointing unless you like sugar, yellow wind, and/or oil.