Still, someone can be wronged with their consent. Consent is not binary. That's why there are minimum salary laws for instance : so that there's not a competition to the bottom.

When it comes to prostitution, the fact that huge numbers of prostitutes are former victims of abuse, for instance, should tell you that something is wrong. And even then, I would say that the minority who could be unambiguously considered to be doing it voluntarily is doing a disservice to women and society in general, by promoting the idea that bodies and what is most intimate can be for sale.