Cacian asked about prostitution, so I will mention what I know (though like Pip, I don't go there). The odd thing about bar girl prostitution is that it gives both parties lots of chances to opt out. The next step after playing "musical girls" is to make a date. This requires paying an exorbitant escort fee to the proprietor of the clip joint, but there is absolutely no understanding that there is going to be sex involved (and often there isn't). Bar girls gain status at work if they get a lot of dates. There is usually a quota they must fulfill, and they can be fired for not keeping up with it. The locations of the dates (arranged ahead of time) are top-dollar nightclubs and restaurants. The dumb punter gets to be seen with a beautiful woman (face, face, face), and the beautiful woman (who gets none of the escort fee) gets at least a top-dollar night on the town. The real winner, of course, is the proprietor, who makes out like a bandit without running any risk with the law. During the evening, the happy couple may or may not negotiate their own arrangements. If they do, the woman keeps all the money (or jewelry or whatever). Or she may string the dumb punter along for more dates before relenting. Or they may just date (at the dumb punter's cost to the proprietor) indefinitely and never have sex. Sex seems to be secondary to the whole thing.
I am describing the way the system works in Taiwan. There is a relatively literate true crime book (okay, a pretty low bar) called People Who Eat Darkness that describes a similar system in Japan. The book is about Lucie Blackman, a young English woman who jumped ship as a British Airways hostess and took a job as a Tokyo bar girl because it paid so much better and wasn't as boring. She went missing after a date, and her skeleton was eventually found in a cave by the sea. The book is mostly about the crimes and trial of the turbo-creep who killed her, but it necessarily describes the bar girl lifestyle in some detail. It helped me to put together the various things I knew already about the subject. But it is an upsetting book, and I wouldn't recommend it to everyone.