Well, Grimm, if you're absolutely sure no man or woman would ever choose to engage in sexual intercourse with people (that they could very well have the possibility of accepting or rejecting) in exchange for a good quantity of money, instead of pointing their noses up and searching for more dignified and classy jobs, then never mind all I said.
But, I warn you, no one would ever choose to clean toilets. Yet, it is done, because people are willing to do it for a certain amount of money. That's how the economy works, and that's how legal and illegal prostitution works.
Furthermore, there are places where prostitution is legal, and many women actually CHOOSE to do it and even like it. It's not porn, no. It's just a different part of the world. I don't personally know any of them, but I don't think I'd be too far off if I said that some of them may find your comments towards their profession to be slightly offensive.
Public health is one of the major reasons for legalizing it. Forcing it underground only makes the health risks worse.and its potential to spread disease makes it a public health risk.
"Men did not make the earth ... it is the value of the improvement only, and not the earth itself, that is individual property... Every proprietor owes to the community a ground rent for the land which he holds." -- Thomas Paine, Agrarian Justice
You can choose to ignore it, but the statistics about prostitution do not lie.