it is true.
other services like:
shoe shining
massage
nail polishing
can all be performed right in the open. this goes to show that prostitution is not a legitimate service.
I would argue that it speaks more of public morality then of the service in question. I believe that there will come a day when no one will have to pay for sex; the whole process is demeaning; good sex is worth way more then paper. But it doesn't end with prostitution; the way we use pieces of paper provided to us by that most corrupt of institutions, the international banking cartels with their money as debt, is the source of it all.
So what do you do in a messed up world? You cope as best you can. Some people find that prostitution works for them. I don't think you'll find anyone who says it's the best job ever, but I definitely think you'll find people who think that it's the best job they can get. Some people even say it's relatively good one; I expect those are on the higher end part of the proffesion. Someone once made an issue of the fact that I wouldn't want a (hypothetical) daughter of mine doing it. It's true, I wouldn't. I'm afraid she would get hurt in one of the many ways that that profession can hurt a person. But while I may think that it's on the more dangerous end of the scale, if my daughter insisted that she wanted to take cash for services sometimes, I would be anxious and if I found it was deleterious for her life, I would point this out, but I wouldn't condemn her for it.