Then there is the disease vector issue...
Did you read the article?
Another common claim is that prostitution causes direct harm by contributing to the spread of sexually transmitted diseases, including HIV/AIDS. However, that may be the reddest herring of them all. In Australia, where sex for money is legal, the rate of HIV infection among female prostitutes is so low that prostitution has been removed from the list of known risk factors in HIV surveillance. In the U.S., reliable data are more difficult to come by, but a 1987 Centers for Disease Control study likewise found very low infection rates among prostitutes.
I'm in favor of legalizing prostitution, as it is one of those "victimless crimes." By making it illegal, it isn't like we are getting rid of it, and instead we are throwing away money at policing it. If prostitution was legal, then there would be fewer pimps, since a prostitute could go to the police for protection from Johns who beat them or don't pay (I'd wager this costs less than prosecuting and jailing them). Legislating morality will not make people any more moral, and only makes the government a bigger nanny state.
Actually, regulated brothels in Nevada have an almost nonexistent incidence of HIV, sharply contrasted to illegal prostitution.