If this kind of thing is likely to offend you then do not use the service. These tell the server a little more about the text which it uses to try and find better anagrams. Computer is for computer companies and computer related texts and Politics is for politicians, political parties and political slogans. Music and Sport are only available with GOLD service requests. Music is for things that are related to music, e.g. pop stars, musical people etc.
Sport is for athletes and anything else that is sport-related in any way.
The GOLD version of the server is a greatly enhanced version of the free version. It is ideal for texts that you are especially interested in such as your own name. The Name Alias service generates anagrammatic names instead of general English. It is great fun and enables you to create alternative names for yourself. A reasonably long text with a good balance of common letters.