BERLIN (AP) — It’s 7 p.m. on a Friday night, a time when Aurel Johannes Marx’s three-room brothel on the edge of Berlin would normally be preparing for its first customers. Sex for sale has long been a staple part of the German capital’s freewheeling nightlife. But amid concerns over the new coronavirus, even the world’s supposedly oldest profession is suffering a sudden slump. At the “Lankwitzer 7” brothel, with its soft red light and bawdy paintings on the wall, disinfectant dispensers have been installed next to the washbasins.