This article is from the Tolkien Newsgroups FAQ, by Steuard Jensen sbjensen@midway.uchicago.edu with numerous contributions by others.
Articles posted to these newsgroups occasionally contain comments
that some consider inappropriate for younger readers. After much
discussion, most participants agreed to mark messages with _sexual_
content with a tilde in the subject line. Individuals can then create
killfiles to screen out such messages as desired. While not everyone
agrees that such a system is beneficial, following this convention is
the polite thing to do. The newsgroup charter recommends the use of
ROT-13 "encryption" for this purpose, but this has become less common.
 
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