The 2004 legislation drove thousands of sex workers in traditional red-light zones out of business in South Korea, but prostitution has still thrived in the shadows.
The Constitutional Court decided to uphold a provision that makes it a criminal offense to voluntarily sell or buy sex, punishable by up tp a year in prison or a fine of 3 million won ($2,600).
The court said that decriminalizing prostitution would inspire an explosive growth in sex trade, threaten the stability of South Korea's society and economy and inspire disorderly sexual behavior.