A suggestion, is to bone up on where the nearest subway station is to your hotel. Knowing this and knowing that there are usually walkups nearby all of them, its just a matter of using the 141 data base to see who is nearby. Example: Kowloon's Jordan Station Foremost Bld.
http://go141.com/en/type-2-regio ... -Bldg.-Massage.html
That or go for a stroll along Temple St, near Jordan station, and bargain with their mamasans for one of the Thai hotties ...
Or, enjoy the very famous pickup bars around Wan Chai
Or, find a sauna and proposition a masseuse for after hours $$$
Just searching any of those names on this forum will give you lots of pointers, and also give you a sense of adventure compared to the 30% chance of being extremely lucky with a dial-a-fu#%