Brothels advertise openly. Cities can regulate prostitution as they see fit. In practice, they often confine street prostitution to certain parts of town and impose conditions on brothels. The PIC distributes brochures, answers questions, and teaches seminars to prostitutes, clients, their spouses, tourists, and school classes. Their goal is to see prostitution fully accepted by society as a professional calling.
More details are available.
Even soft drugs such as Marihuana are technically illegal to sell, buy, or possess. Possession for personal use is also not prosecuted. Everything is advertised freely in the newspapers.