Ulsan Police issued arrest warrants on Friday for a 22-year-old man, Jang, a 43-year-old woman, Kim, and two others for allegedly soliciting prostitution on Internet chat rooms. Police also confiscated their client list.

The 34-page notebook contained a list of paid sex acts that took place in motels or apartments for W100,000 to W120,000 each from mid August. The list included detailed descriptions of male clients, their Internet chatting nickname and their cellular phone numbers. Men were described by their distinctive characteristics, such as having penis enlargements, having sex three times in two hours or lasting a long time. Some men were blacklisted for having no money or being "retarded." Other notes included the number of times a john was serviced, the john's manners, where the sex took place and when the money was to be paid. The agency had been managing its clients, with this list.

The police said that three women in their 40s had paid to have sex with men in their 20s to 40s and added that, according to the list, one woman had slept with as many as 15 men a day.

Police said that with the enforcement of new prostitution laws, it predicts that underground prostitution, such as Internet prostitution, will gain popularity. The police plan to summon all 180 men on the list for further investigation.

(Kim Hak-chan, chain@chosun.com )