Apparently this prostitute reads New Scientist, volunteers in her community, and books by e-mail. Since, as the New Scientist reported, people lie more often by phone than e-mail, she gets fewer cancellations and people who pay for missed visits.
Mass hysteria! Dogs and cats living together! Prostitutes volunteering and having a missed appointment charge policy!
Thanks to Marginal Revolution for keeping on top of this vitally important social issue.