Flutterby™! : Superfreakonomics gets prostitution wrong

I enjoyed Freakonomics, but I've heard nothing but bad about the sequel: Superfreakonomics. Figleaf's Real Adult Sex piles on to the criticism: The Real Lesson of That Dumb Chapter in Superfeakonomics:

The story in Levitt and Dubner’s column about the woman who flies to Texas to do “erotic” things to a guy with his briefcase is emblematic not of advances in prostitution. (I’ll give you a nickel if I can’t find an example of similar fetish-serving sex work any time between, say, 1809 and 1959.) It’s emblematic of all that’s left!