Support. Most of modern American heterosexual dating culture is glorified prostitution with a stifling Puritan/Victorian veneer anyways.
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I'm not convinced he's wrong, but one man's modus ponens is another's modus tollens, et cetera.
He's categorically wrong. Women most likely to have causal sex with a string of different dates are also the most likely to pay their own way on a date. If anyone is exchanging sex for money, it's conservative marriage minded woman who are trying to find a breadwinner.