A company called Sonicwall, who provide dodgy internet filtering disservices, have determined that this site is pornographic. So that's DHA's next job sorted for when the bottom falls out of the programming market.
I have emailed them asking for an explation. I don't expect to get one.
Incidentally, this is the second time I've been incorrectly accused of being a pornographer. A pint for whoever can tell the amusing story of the first time in a comment here!