There is a world of difference between underage prostitution as you describe which of course is wrong on all counts, and women in their 30s and 40s offering private services in apartments etc. The latter are perfectly capable of making rational decisions with regard to their actions and without them many men such as invalids or socially challenged people, who otherwise cannot achieve some sort of sexual experience, would be denied such service. And guess what - that could increase wife battering and rapes because such services offered by responsible adult women are in effect a safety valve for frustrated men and also married men who feel they need some additional intimacy. That's human nature, and there's nothing wrong with it.
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from the article: In prostitution, the customer is always wrong