In order to go with the prostitutes you don't talk to them, you talk with the madam (owner of the establishment) and after you pay her she calls the girls and you choose one...
where is she at?
Edit: Nvm found them, i feel so dumb, this whole time the door was right on the basement, and never thought to use it, thought it was one of those blank doors like in TW 1 inside the inn.
[Edited by crsojo, 5/25/2011 3:02:19 PM]