Oh yes, prostitutes and professional ethics.

Why not? they are looking for the money and if they want to get it they need to follow rules of capitalism

And what those rules tell about this sort of business?

I don't think any rules are correct in case of prostitute's business

You count it as something special?

Yes, I mean. It is almost the eldest market sphere

I think, it survived only because it changed through the history

But it is not historian tread