A prostitute could sell her own services, provided that she's not being coerced as a result, and benefit as a result, provided she's not being coerced or threatened. She could run her own enterprise and hire those whom she wishes to help her, provided it's at a fair market value. All of this is provided that she is not being coerced, threatened, or somehow gotten to take drugs so that's she's forced to pay for them.
That is my understanding of the act.