Yeah, after 20 years walking the streets, a hooker is going to look pretty "used up." On the other hand, when it is really tried (as Guiliani did with Times Square), prostitution can be reduced.
Sounds like the day I was really thirsty but passed up a chance to buy sour milk. Who in their right mind would pay to have sex with Rudy?
Or when it is really tried, as in Holland, legalized prostitution can be pretty safe. Pimping, underage and slave-trade prostitution is still illegal, and all enforcement concentrates on those, leaving the regular working girls alone.