I doubt the people involved in that protest the other day would have any interest if it wasn't an LGBT related book. They've been trying to form the grooming narrative for a while now.If this sex book was aimed at underage girls, the age of consent being 17, and carried within it instructions on how to give a male a blowjob, you can imagine the furore there would be.
That said, 12 is too young IMO for any form of 'sex books'. I thought YA books were directed at older teenagers? but I know very little about it tbh. However from what I've read about this one, it looks healthier than some of the porn out there that kids are undoubtedly watching. Tiktok is also quite disturbing.