This thread explains
http://www.gnutellaforums.com/open-d...tml#post277428

If you want to avoid the porn results, make sure that 'ignore adult content' is ticked in tools > options > keywords.
You can also add specific words to the keyword filter (eg laid)...here are some more tips for that!
http://www.gnutellaforums.com/154163-post17.html