Please dont go to any massage center along with unknown people you meet on the street. Here is my experience,
A nice cute girl approached me and offered massage for 100 rmb. She took a cab and we went to nanjing road, puxi. Once we are in she left and i sat in a small room and a girl came and the massage was over in a few minutes. Then she took the money and at this point 3 guys entered the room and they would not let me out and they beat me and thretened me to pay 10000 rmb for using the room. Then they took my wallet and it was a horrible situation. I was there in a very bad situation and paid them 9000 rmb and came out. I could not fight with them as it was they blocked all exits and i was trapped in their place.