IT'S ONLY CORRECT IF IT'S TRUE. Well, no, I wasn't really kidding about not seeing why commercial sex adds wrongfulness to allegations of corruption. Stipulating that taking bribes is bad; I don't see why taking bribes in the form of free hookers is worse than taking bribes in the form of money. Nor do I quite understand what Garance is saying about prostitution being "a form of slavery." There definitely is some sex slavery going on in the world. At the same time, some of the world's agricultural laborers are slaves (and, historically, this has been the primary use of slave labor), but clearly working on a farm isn't a form of slavery unless you're actually working on a farm as a slave.
As far as I know, there's no evidence that the women involved in this aren't just perfectly ordinary hookers trying to engage in a voluntary exchange of sex for money.