Whether these goals can be met if we must “oppose prostitution” is actively being argued in the courts, and perhaps more vitally, in the many settings where sex workers provide services societies continue to disdain and demand.
http://plosmedicine.org/article/info:doi/10.1371/journal.pmed.0040207#article1.body1.sec5.p5

In July 2011 the US Court of Appeals ruled, 2-1, that the anti-prostitution pledge requirement violates the First Amendment because it compels grant recipients to voice the government’s viewpoint as if it were their own.

Nicole Masenior and Chris Beyrer, the authors of this paper, posted a blog on Speaking of Medicine (the PLoS Medicine community blog) about this decision after six years of debate in the US courts system. Read it here:

http://blogs.plos.org/speakingofmedicine/2011/07/29/decision-rendered-on-the-prostitution-pledge/