Because unlike surfing/climbing and biking I believe that prostitution is inherently abusive.
Demonstrate
that, and you'll have a far more persuasive argument.
Inherent: Existing as an
essential constituent or characteristic;
intrinsic.
There's your standard of proof.
The experts tell me that very few people willingly engage in prostitution and I believe them.
Good. If experts tell you this, you'll certainly be able to provide a link to a source where they're saying it online.
I've worked some awful, low-paying jobs before. I worked those jobs because it was preferable to being homeless and starving. Would you say that I worked those jobs
willingly?
Do you think my life would have been better
without those jobs? Would I have been better off if I lacked the money to buy food and pay rent?
If a person has a choice between a lousy job and no job, I support their right to work the lousy job. That includes prostitution.
In a perfect world,
everyone would have the education/job skills to get a better job. Prostitutes, migrant farmers, day laborers, etc. And
that's the solution to the problem. Educate and train people so they
can do something else. The ones who hate the job will quit. The remaining ones will be able to get better pay and working conditions, because the supply of prostitutes will have dropped (and the demand will be the same).