Although two generations of its supposed principals were arrested and tried, it continued to enjoy a near-monopoly of the online Hong Kong sex trade.

[1][3][4] Sex141 was founded in 2002 by a HKUST graduate, Chan Sai-ngan (陳世雁), and Cheung Ming-man (張明文), to offer on-line advertising to sex workers.

[1][5] In 2005, the two programmers who created the site were convicted of one count each of "conspiring to live off the earnings of prostitution arising from the ads that appeared on their website".

[1][6] The site was taken over by former University of Hong Kong student Pang Man-wai (彭文偉)[7] and Yan Guobing/Yim Kwok-bun (嚴國彬), who both commenced pimping to increase revenues.

After the second generation at the helm of the site were arrested, websites continued to operate, further expanding into directories for Macau, Taiwan, and Thailand using the Nightlife141.com domain name.

[1][3][4] At a press briefing, police said the syndicate "provided a comprehensive service to sex workers and organised prostitution groups.

Details consist of name, age, race, languages, working hours, cost, address, measurements, photo gallery, transport directions, a Google map, and a personal description.

It was alleged that the group deliberately encourages negative "money-drop reviews", expected to generating more revenues, either the HK$200 (approx.