For those of you who are not following wikimedia-l: you might be interested
in this discussion about searches with harmless keywords bringing up very
NSFW images (an old and highly controversial topic):
http://thread.gmane.org/gmane.org.wikimedia.foundation/71770/focus=71903
(I am linking the (currently) last few mails of the thread; the discussion
leading up to them is also interesting, but terribly long.)