I remember being in one those strip booths in Amsterdam,and the little guy with the bucket and mop.
You could also see guys faces as they were wanking off at the other end of the circle...it was hilarious.Then you had the private booths where they had that magical curtain,and you had to keep firing in the 1-2 euro coins in the slot so you could have your wank and then wipe it up with the tissue she gave you.
I couldn't see the point to it though as you could've got your Nat King Cole (Hole-Pussy) down the road,but some people are on tight budgets I suppose.