From my third link
It is estimated that 100,000 to 3 million teens are nearly invisibly prostituted per year in the United States (Walker, 2002). If we allow prostitution to remain hidden from view and basically invisible to the law as it is today, we allow a number of teens to be swept up into prostitution every year. When adult women decide to exchange money for sex, it is a personal choice open to them under the philosophy of a free, democratic society. When troubled minors who do not yet have the social survival skills decide to prostitute, they are often manipulated by opportunists who exploit these teens, typically leading to horrific ends. Legalizing prostitution will help prevent these instances through regulation.