In fact, it looks like just the opposite:

Another argument for legalizing prostitution in the Netherlands was that it would help end child prostitution. In reality, however, child prostitution in the Netherlands has increased dramatically during the 1990s. The Amsterdam-based ChildRight organization estimates that the number has gone from 4,000 children in 1996 to 15,000 in 2001. The group estimates that at least 5,000 of the children in prostitution are from other countries, with a large segment being Nigerian girls (Tiggeloven: 2001).

Child prostitution has dramatically risen in Victoria compared to other Australian states where prostitution has not been legalized. Of all the states and territories in Australia, the highest number of reported incidences of child prostitution came from Victoria. In a 1998 study undertaken by ECPAT (End Child Prostitution and Trafficking) who conducted research for the Australian National Inquiry on Child Prostitution, there was increased evidence of organized commercial exploitation of children.

Most children that end up in prostitution in the Netherlands are boys or young under aged asylum-seekers - particularly Nigerian girls. ChildRight claims this group numbers some 5,000 children. But recent years have seen a significant rise on the number of Dutch girls forced into the sex industry. Among them are an estimated 5,000 runaway or homeless children, many of whom are mentally retarded. Another large group (also 5,000) are `ordinary' Dutch schoolgirls, aged 13 or 14 from a "regular home environment" who are lured into prostitution by so-called "lover-boys".

Typically, arguments for legalisation/decriminalisation are based on the mistaken assumption that a regulated industry will contain the growth of the brothel and street trade, eliminate organised crime and end child prostitution and sex trafficking.

Significantly however, there is absolutely no evidence to support these claims. On the contrary, in countries such as the Netherlands, Australia and Germany, where this policy was adopted - the exact opposite is true.  These nations have all experienced a dramatic increase in legal and illegal prostitution, child prostitution and trafficking in persons for sexual purposes. The Mayor of Amsterdam, Job Cohen, admitted that the policy of legalisation has been a failure and has instituted a reversal. He conceded that organised crime dominated the industry in which sex trafficking, exploitation, drug abuse and money laundering was rife.

It is the hypocrisy of those who would censor in other occasions that I note....If you are going to have an exception for discipline and order, then the teachers on site should be given the discretion to ask people to change tee shirts in order to avoid a confrontation, as a matter of just being practical....

It was across the street from the school--and that is how the administrator saw the banner.  The kid who was expelled never even attended school that day...He just showed up and held the banner....