The fact that prohibition cannot prevent prostitution is not an argument against prohibition. We have laws prohibiting murder, and yet murders happen. Our laws deter some murders and they express our society’s moral outrage regarding murder.  Similarly, laws prohibiting prostitution deter some prostitution and express our society’s moral condemnation of sex for hire. These laws do not create harms, rather prostitution itself creates harms, by robbing those who participate of self-respect, and contributing to the spread of sexually transmitted diseases. It is inevitable that laws prohibiting prostitution will make it riskier to engage in prostitution, as this is the purpose of such laws: to provide disincentives to those who might otherwise engage in this activity.