It is said that the ruined Roman city of Pompeii once had 35 brothels, that were known by the Roman word 'Lupanar'. With a population of 10,000 people in Pompeii during the first century CE, this seems quite a lot obviously, but then early Pompeian excavators classified any building containing erotic paintings as brothels.
The photo above shows a sign carved out in the pavement, pointing to a brothel.
And to any of you who wonder: "Hey, is that a .. ?"