I'm not against those who work for sex, but the idea to earn for a living doesn't seem nice. IMO, sex should be for 2 people (or more for others who prefer polyamory) who wants to be intimate/romantic with each other. My point is money should not be the purpose.
Netherlands recently ruled a pimp can sue its prostitute if they refuse sex enough times for breach of employment contract. I dont think you understand the full rammifications of legalizing it, employment law goes both ways.