Legalization means that the state imposes regulations under which women can be prostituted. In effect, regulation means that under certain conditions it is permissible to exploit and abuse women. Considering the extreme conditions of exploitation in the sex industry, those distinctions are nothing but abstractions that make for good academic debates. They are, however, meaningless to women under the control of pimps or traffickers. The renaming may clean up the image of prostitution, but it doesn't end the violence and exploitation.
Prostitution is an extreme form of gender discrimination.
Legalization of this violence to women restricts women's freedom and citizenship rights. If women are allowed to become a legitimate commodity, they are consigned to a second-class citizenship. Democracy is subverted. Women's bodies and emotions must belong to them alone. They must not be traded or sold.