I've been trying to get a moment to write a response to this since it was posted. Here goes.
Prostitution is a necessary evil

. From my perspective, it's been here for a long time, and it's pretty much going to stay here. In an ideal world, the workers would get a decent wage, the government would get it's cut, and the employees would have a health plan. 👍
This ain't an ideal world. Pimps will offer protection to a hooker in exchange for their services. Often times the person in this line of work is there with additional baggage. Drugs, escape, income problems. Others are lured there with the promise of a better life with more money. It's rare that it works out that way.
Do a quick google search for "dead porn stars" and you'll see a slew of them that committed suicide

. Prostitution and it's relatives are not a pretty business. It doesn't matter how Hugh or Larry sell it, you're still talking about a base animal act. When someone is willing to stoop to the level of paying for it, they've crossed more than a few mental barriers. This becomes a dangerous ground.
When you look at it through rose colored glasses, it's a simple act of passion with an exchange of money. I can't remember which comedian (George Carlin?) said this "You're not paying for sex, you're paying her to go away after sex. Because in any relationship, you're paying for it anyways." Usually a sad but true statement.
So what can we do to make it safer, and cleaner? Not much I'm afraid. Look at Heidi Fleiss. She tried pretty hard to cater to upscale clientele. That worked

. Then look at the corners of major cities. Nope, it's not working there either.
How often have you heard "Sex is a drug"? Enough times to know that there is some truth to it. And just like other drugs, it has it's pitfalls when trying to legalize it. Why legalize something that any woman or man can find at a local bar? Well, because people have standards, and they want to take a person to bed that appeals to them. You can't always find that in a bar. Some want the act without the consequences of the next morning.
I don't think there is a way to make it legal and safe. It's a dirty business to begin with and it's a toughy to clean up.