since 2002 we have a law about that in germany, it is actually legal now.
They have to pay taxes, its a normal job, etc...
I think that is the way to go really. If you want to go to a prostitute, where are you going-
the one that is registered and where its a business, or the dodgy backstreet one that has probably been brought here from some east european country and forced to do it?
I would certainly not go to the dodgy one, but to the one who looks professional, where I am sure Ill get a good job for the money and dont have to be afraid to be mugged on my way there.
Its the same like with tattoos, since there are big tatoo parlours in cities, with health and safety regulations and everything sterile, noone would go to a backstreet tatooist anymore who does it in his basement or something... just by making it official and popular, the dodgy ones die out.