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if the article is even true. I read it day before yesterday at the Daily Beast and had doubts about its veracity, or at the very least the details of the arrangement. What rich man is truly fool enough to turn over a sensitive document like his tax return to the sort of organization that could one day blackmail him?
As to the author's story, if true, what makes it prostitution is that the arrangements were quite explicit. While she may be providing companionship, she is also providing sex for money (or material advancement) as part of an explicit deal.
The difference between what she is doing and what a streetwalker is doing is the level of luxury and the price. Of course, if she was a girl from some trailer park actually trying to persuade some rich man to marry her, we would all be utterly outraged. How dare she presume?
It is peculiar to me why the attitude of the typical liberal is one of being so much harder on golddiggers or even on women who marry up than it is on prostitutes.