Earlier quoted context omitted.
E.g. actor, singer, laborer, masseuse... as a matter of degree, each is a 'slave' to their client(s)? I think that's exaggerating the case.
None of these jobs involve subjecting oneself to multiple disease vectors every day and arbitrary acts of violence. Plus, as the 'my body my choice' crowd recognizes, our bodies are one of the most important sources of our identity. To have others treat our bodies as disposable commodities essentially communicates to us that we ourselves are disposable.
If you argue for changing the economic setup so that nobody has to do work they would rather not be doing -- I'm all for it. But don't make it sound as if prostitution was anything special in that regard.