This latter issue is particularly convoluted as leafing through the back of many a local newspaper or postings at Craigslist (or other websites) will aptly demonstrate. There is any number of "escort services" for sale, with the majority presumably being a thinly veiled offer to exchange sex for money.
The wide spread availability of these listings led to today's maps which visualize the distribution of directory listings for "escorts" within Google Maps. The map of the absolute numbers of escorts identifies major urban centers as key sites for this activity, with Denver, Dallas, New York and Miami representing particularly large clusters.

It is only through the analysis of the relative number of escort listings (see the map below) that more surprising patterns emerge.

Most large urban centers are still present although some such as Detroit or Salt Lake City are very small. Additionally, smaller cities such as Tampa, FL, Knoxville, TN, Tulsa, OK and Lexington, KY appear to have a much higher number of escort listings than their mere size would suggest. As Lexington is the U.S. home for floatingsheep.org we are somewhat nonplussed at this result. Who knew? Particularly since "Sin City" aka Las Vegas is completely absent in this map. Not really the category that Lexington's city council has been trying to get the city highly ranked on.
But the clear front-runner in this category is Texas in general and Dallas in particular which appears as the most specialized metropolitan area in escort services in the U.S. The nearby city/suburb of Plano contains the highest rank which leads inexorably to our final observation (apologies in advance) that…
...Debbie does Dallas, but prefers Plano.