Topics? No, I don't agree with that. Almost any subject can be treated in an age-appropriate manner.

A 7-year-old doesn't need to read about nearly any topic. Excluding any mention of all of those subjects from the school library leaves a nearly empty library.

For that heavy-handed of a response to be _legally mandated_ requires not just "no need", but some strong evidence of harm. Mentions of sex, oral or otherwise, doesn't actually have much evidence of harm. Certain treatments of it might -- but that's not what the law targets, nor can effectively target. It covers mere mentions or small bits of explicit language, even where that is necessary for the effect of the book. These can and do make parents profoundly uncomfortable, though, and that is worth taking into consideration.

I would think that the usual approach of professional librarians curating based on their own judgement, subject to some oversight from the local school boards to take into account these valid discomforts, but largely baseless fears would be a far better approach.