I’m pretty sure there isn’t porn for a whole host of obscure stuff, like a certain South African-only Sci Fi puppet series from the 80s that I shan’t name for fear of invoking the rule. There’s lots of stuff so obscure that it doesn’t appear on the 'net or in 'zines.
H.F. Saint’s mainstream novel Memoirs of an Invisible Man, later made into a rather different movie starring Chevy Chase, is all over that.
Rule 35: http:// wetriffs.com
OK, so are there homoerotic spelling bees and stormchaser porn now, too?