-Where women have their own choice
-Where women can decide their own boundaries (with the right knowledge and free will and mind)
-Where women can earn something from doing the work that they actually love doing
-Where women are not involuntary forced to do something against their will, mind, spirit or moral values
I don't feel that any kind of prostitution is supposed to be wrong or illegal, and it can actually be a useful profession if the guidance is right in the upbringing of young women. It helps connect better to the human body, their own body and the guys body, and it helps learn how to relate to one another on a deeper level than the surface, because you deal with multiple bodies in different ways.
In some ways if the guidance is right it is a wellness and health profession actually and can contribute for both people towards healthy sexuality without judgment and stigma and what other people might think about it what is right and wrong.
It is easily said that it is human trafficking while there are multiple ways to guide the human trafficking into a greener zone instead of the red illicit zone. If the woman works voluntary in that field without judgments of others I can see it even as the purple zone. The problems are the judgments of other people that look down on it, are jealous or malefic towards you because you do that kind of work. It is supposed to give a woman a free will of her own boundaries and what she expects of it. Obviously it is not a job where you make babies that easily and there is a lot of caution on mutual transmitted health guidelines, but still there is a lot to gain, besides fruitful experiences, balanced living and happy moments.
IF you don't judge your clients you can actually learn a lot and have a better time than if you are ill tempered and difficult to work with anyway. Obviously you still have to be able to draw your own boundaries, if you want and choose so, but this is merely a question of love, hidden love, one-sided love, danger, risk, hate, envy, jealousy and other difficult or hidden emotions.