For more nightlife action, check out the Cultural Square in Dongcheng District.
They are houses in residential areas and look like any other on the block but behind the doors I have found a few treasures.
The popular areas are ShaYuan Shichang near the meat and vegetable market and in Touxu near the Luyuan Drinking Delivery Shop.
The menu is limited to a hand job or a blow job for 300 Rmb.
Yes it was a bit of work but the rewards have been good.
This is all secondhand from Googling the subject over the years.