One thing I can think of Joe is to have a separate thread index for "BAWDY:...", so that the titles do not appear on the main page, with a link from the main page for those who want to visit it.

That would require virtual duplication of most of the functions of the main index/page; it might be too hard work. But it would be the most foolproof method. It would take away the problem of access from libraries/schools etc, and also the problem of people being offended by seeing the bawdy titles staring them in the face. Anyone who wants to visit the Bawdy Index would be able to do so separately and explicitly.

However, that may mean then that this index would get very few hits.