Yes, exactly. Prostitutes can sell themselves for money, every man has the power not to give her his money.

What's the problem?

That is exactly what I am saying. There is nothing inherently wrong about selling sex. It only becomes wrong when a woman (or man, or child) is forced into sex work.

What's wrong with prositution if a women chooses to do it? The huge problem with it is generally is that people are forced into it through various means.