TongRen Lu, Puxi (pronounced PuChii), Shanghai - ask any taxi driver.
Hit Mahattans or Judy's. bars...go about 11pm, the girls will approach you. You don't need to buy them drinks. Rate - approx Rmb 1000 for the night, can then get lower rates as time passes - Rmb 700-800.
Or try somthing quieter.....Xin Dia Ti, posh area for bars and restaurantes, goto Luna Bar or Rendevous, sit by the by the bar, guaranteed you will get some good looking girls sitting near-by.
If you're from Mumbai, maybe you can give me some tips as well on where to get the ladies (high-class), as the Mumbai thread has too much info.