Is there a word for this?

Is there a word that means of interest to adults without meaning adult in the "sexual sense"? The idea I'm trying to convey is that some topics are of interest to adults but would be irrelevant or uninteresting to children - like the workings of the stock market or office politics

When I mention I wouldn't want a child reading my LJ, it's for that type of adult content - not the X-rated one and I can't really find a word for it.