advertise for clients through the Internet and local classifieds. Most popular mainstream newspapers will carry such classifieds with brothel guides as an insert within racing form guides. Yellow neon advertising boxes were used to advertise sexual services to such an extent that "yellow" (黃) became synonymous with prostitution. Macau Prostitution is legal in Macau unlike in mainland China, because the city is a special administrative region of the country. However, operating a brothel and procuring are both illegal in Macau, with the latter punishable by a maximum jail sentence of 8 years. The city has a large sex trade despite there being no official red-light district. The trade is said to be controlled by Chinese organized crime groups, which has occasionally led to violent clashes. Street prostitution takes place in Macau and prostitutes also work in low-rent buildings, massage parlours and illegal brothels, and the casinos, nightclubs, saunas and some of the larger hotels. Most hotels, however, have suspected prostitutes removed from the premises. Many of the city's sidewalks and underpasses are littered with prostitutes' calling cards. Japan Prostitution is illegal in Japan; however, as the definition of prostitution is "intercourse with an unspecified person in exchange for payment", the sale of other sexual services is legal and widespread. Prostitution has existed throughout the country's history. While the Anti-Prostitution Law of 1956 states that "No person may either do prostitution or become the customer of it," loopholes, liberal interpretations and loose enforcement of the law have allowed the sex industry to prosper and earn an estimated 2.3 trillion yen ($24 billion) a year. In Japan, the is not synonymous with prostitution. Since Japanese law defines prostitution as "intercourse with an unspecified person in exchange for payment," most fūzoku offer only non-coital services, such as conversation, dancing, or bathing, to remain legal. Nevertheless, polls by MiW and the National Women's Education Center of Japan have found that between 20% and 40% of Japanese men have paid for sex. Mongolia Prostitution is illegal in Mongolia but widespread in some areas. The Global Fund for Tuberculosis, HIV/AIDS and Malaria estimated there were about 19,000 sex workers in the country in 2006. Many women in Mongolia turn to prostitution through poverty. Sex trafficking and child prostitution, including child sex tourism, are problems in the country. North Korea Prostitution is illegal in North Korea and, according to the North Korean government, does not exist. Under