This does not combat anything. The prostitute is trying to sell something to someone. Making it illegal for the customer to buy something from the prostitute does not solve anything. In fact, it discourages the customer from entering into the exchange.

There is a reason that a person chooses to be a prostitute. You may not agree with that person's decision, but criminalizing one party of the exchange doesn't change the prostitute's available choices. In many cases, prostitution is the only way to finance drug addiction, because of drug prohibition. You can criminalize any party -- the prostituted or the customer -- and it doesn't address the root issue, it only suppresses it.

"Making it illegal for the customer to buy something from the prostitute does not solve anything. In fact, it discourages the customer from entering into the exchange."

What it does is destroy the market for those exploiting prostitutes. I.e. traffickers. It changes very little for those who want to engage in sex with prostitutes.