I've found temptation in some of the holiest of books, I'm ashamed to say. Heck, even things on this forum, as censored as they are, could send a recovering addict's imagination down the wrong path! So the problem might not be the reading material at all; it might mean that you're not meeting those potential triggers with the right mindset.
We'll never be able to eradicate all of the temptations in the universe, try as we might. There's no universe-filter. Sooner or later, something clean and innocent is going to make us think bad things, and it won't be that thing's fault in any way. If we're at the point where we've accepted our OWN powerlessness over this, then this sort of micromanagement might not be necessary. Of course, it's still good practice to avoid overtly smutty literature, etc., and even things that have potential for triggering thoughts. But, believe me, an addict can find SOMETHING bad in a textbook about WWII fighter planes.