"pornographic" am I thinking of the same "Ender's Game" as in the one about kids training to be space combat tacticians and
whilst it has been a few years since I read it, I certainly don't recall anything that would come close to the term pornographic. As for violence, all I can recall is "bullying" which imo is exactly the kind of thing kids need to be made aware of and of course the spoiler part, but that's "fantasy" violence and no more damaging than the murder of 100's of thousands of people on the death star
There really must be more to the story than just the book or my lack of memory