There is a strong movement afoot to define any material teaching about
1) consent (whether it mentions sex or not)
2) the child's own body (in ways designed to help them recognize and avoid things like sexual abuse)
3) queer issues of any kind, but especially trans issues
as pornographic, regardless of the actual content, so that they can ban it and claim they're saving the poor children from horrible, horrible sexual material.
This is not a new movement; conservatives have been trying to ban queer people from any kind of public visibility for decades by claiming that their very existence is sexual, ignoring the fact that heterosexual romance and sex is being shoved into our faces constantly, often in far more blatant ways, and often in media explicitly aimed at children. They're merely redoubling their efforts now that it's becoming clear that society at large is starting to genuinely accept trans people, which they cannot abide.