I really don't know what is out there now. I know that I have met a few chicas that said they used to work in a "casa de citas", but they are kept very hush hush. Most taxi drivers are only going to take you to where they get a commission...that being said, if the driver knew of a casa de cita, then he would be getting a commisssion. Now if a place like that had taxis pulling up all day long, the neighbors may become suspcious and it could be trouble for the house. In short there probably are some out there, and I doubt a taxi driver would take a guy he doesn't even know out there. One thing for sure, don't let any English speaking "helper" from the Zona Norte take you to one...