In a sense it already is; women price the value of their body and sex like any efficient market. Market distortions like divorce-rape, children/pregnancy/abortion as bargaining tools, alimony/custody, "metoo" all affect the frequency and price of sexual transactions.
I'd make it legal, but it carries a scarlet letter all the woman's life (I guess some dudes will do it too) so no man would unknowingly settle down with one.
Men marry porn actresses, so I'd guess they'd also marry whores. Or ex-whores. If that's the kind of wife they want, it's their choice. I think most rational men would agree with your scarlet letter comment, however.
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