hookers with style (or no style, depending how you look at it)

i'm kind of used to seeing people in uniform. for example, in the hospital everybody has a uniform. the docs do, the nurses do. the ED nurses do, as well as the guys doing the cleaning. and then, business people have a suit and tie, that's kind of a uniform as well, and so do subway drivers etc.
this is why you might not expect me to be surprised when i walked downtown berlin one night at 3 am and found many women standing around, looking pretty much the same - long white boots, long, straight white-to-blonde hair, ridiculously thin waist, and of course, a pouch of money (and condoms, I was told). a pink jacket or skirt is common, though not obligatory.
for a second there i thought i am in the middle of shooting a madonna clip, but then realized this is a workers neighbourhood, if-you-know-what-i-mean.
I guess it makes things easier, you spot the employee of your choosing, and then... i'm not sure... do you have to pay for insurance as well? do they make you sign some forms? that wouldn't be too fair, when you're drunk (a popular target population).