Prostitute Mary poses as she opens the trousers of a guest at the "GeizHaus" brothel in the northern German town of Hamburg April 16, 2009. It did not take long for the world's latest economic crisis to have a trickle-down effect on the world's oldest profession in Germany. But in one of the few countries where prostitution is legal -- and thus extraordinarily transparent -- the industry has responded with a special stimulus package of its own: modern marketing tools, rebates and gimmicks to boost flagging demand. Picture taken April 16. To match feature GERMANY-PROSTITUTES/ REUTERS/Christian Charisius (GERMANY)