I went to China for vacation last summer. I found out that the hotel in Shanghai I stayed at (they said it was four star but it was three...there were cockroaches in the hallway!) that the karoke bar and hair salon are fronts.
I had wandered by the karoke bar and the manager (who turned out to be mama-san) dragged me and showed me a bunch of girls who would keep me company. I don't sing and the girl barely spoke English (I don't speak Mandarin and she didn't understand Cantonese). The mama-san then started to negotiated the price of the room, the drinks and the girl. I didn't drink any of the beers she and the girl had but was charged for them. She even made me pay the 100 yuan tip for the waiter. The girl was very cute but seemed very inexperienced. We started with a cowgirl (no BJ) and I wanted to change to mish by rolling her over. I accidently slipped out rolled her below me and she thought I was done and immediately cleaned me up. She apologized and I had to do charades with her that I wasn't done and need to finish off. If she wasn't so innocent and cute I wouldn't have tipped her an extra 50 yuan despite the blue balls.
As for the hair salon place, you can call them and ask for a girl to come to your room. The one that came to my room was a gold digger. She charged me extra for showering together (it wasn't erotic at all, especially with her wearing a shower cap) and tried to get me to pay extra for a BJ (she gave me quick samples). In all, it was about $300Cdn wasted on her.