SEYMOUR Butts had an unexpected adventure down at Shamshuipo's Golden Arcade yesterday afternoon when police swooped on sets of suspected obscene computer CDs featuring his erotic activities. Fifteen CD-ROM copies of The Interactive Adventures of Seymour Butts (starring some dudes and a lot of babes) were the main prize of an anti-pornography operation involving 80 police officers and Television and Entertainment Licensing Authority (TELA) staff. An additional 100 computer disks were seized, and about a dozen people will be prosecuted, police said. The police found indecent material in 13 of the 14 shops they visited, although only two had material they suspected of being obscene. In other shops throughout the busy computer shopping precinct, staff had hastily hidden pornographic discs on shelves behind innocuous programmes such as mathematics tutorials. A TELA officer explained that interactive explicit sexual material would be almost given a Class 3 classification by the Obscene Articles Tribunal, and could not be sold legally in Hong Kong. He said the other material, including discs labelled Super Fetish, Sexy Library and Petnhouse Best (sic) was almost certainly only indecent, and the shopkeepers would be warned not to display the material openly. District Operations Officer for Shamshuipo, Winnie Chiu Wai-yin, said this was the first such operation at the Golden Arcade this year. ''In this raid we really wanted to give the shopkeepers a warning before the school holidays start that they should not display indecent material where children can easily see it,'' she said.