I don't think it's an issue of common sense or morality really. If it is against your moral code, don't engage in it. It's that simple. Not everyone sees things the way you do and should have the right to do so if they feel like doing so. As long as consenting adults are involved there's nothing wrong with it, in my opinion.It's obvious you don't get it. I won't say anything more on the matter, the idea of Prostitution can only be argued by those lacking in even the most basic common sense and morality.