It seems to me that we are conflating two separate ideas.
The first is the freedom for any person (and most, but not all are women) to do with their bodies what they choose. I see no objection to the principal that a woman can make the choice to exploit her own sexuality for money, and to earn her living doing so. And frankly, what could be more feminist than that?
But prostitution is not simply people controlling their own bodies and living off the avails of their own prostitution. Prostitution has been been largely exploited by others--madams and pimps, organized crime gangs and human traffickers. This is the ugly reality of street prostitution in the contemporary world which cannot be countenanced.
So, does the legalization of the former, serve to mitigate the poisonous influence of the latter? I would like to believe that it does. I want to believe that groups of clean, sober, careful sex workers will gather together in cooperative business models and open clean, healthy, tax revenue generating brothels that people will feel free to patronize with their heads held high.
I would also like to believe in Santa Claus, the Tooth Fairy and the Easter Bunny.
At the end of the day, I support sex workers who are challenging laws that put impediments in the way of their business. But I am loathe to see us move piecemeal into a world in which some sex workers have improved their working conditions, while legitimating the exploitation that happens to the poorest and most vulnerable. We must, therefore, put in place mechanisms to allow women who are being exploited by others to extricate themselves from exploitation; suppress the organizations that would perpetuate the trafficking, and leave the sex work to those who willingly embark on it as an affirmative choice.
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--James