Completely agreed. Why would there be either an elimination or explosion of either sex-trafficing or child sex exploitation if prostitution is brought into the fold of legitimate commerce? Sewing shirts is legal, yet we still have sweatshops in America full of immigrants with limited communication skills and limited options forced into labor with illegally low compensation and dangerous working conditions. The more secure and more knowledgeable will always be in a position to exploit the less secure and the less knowledgeable. This is the basic operation of capitalism.
I think the question is do we ban manufacturing or agriculture because of the exploitation rife in both industries? Or do we set minimum standards as a society for the treatment and compensation of labor and the ability of minors to consent to labor, and treat violations of those standards as criminal behavior to be punished? Why is sex so special that we can't find a standard to apply?