From Wikipedia the book is intended for 12-18, or a better description, someone who is going through or has gone through puberty. This is the same age where children start to learn themselves and others as a sexual beings we are. And in Judaism, a 12 year old IS an adult, religiously speaking. Bar|Bat mitzvah.
https://en.wikipedia.org/wiki/Gender_Queer:_A_Memoir
And even in the US across most (all?) states, a 16 year old can legally have sex. Pictures however are "child porn" or csam, for fuck-if-i-know reason. But sex? 100% legal.
And again, *pretending* this doesnt exist, or hiding or destroying this knowledge is NEVER a good solution. Adolescents are going to get knowledge. Id rather them get the correct knowledge, rather than slop, misinformation, or worse. And its even harder for LGBTQ folks. So much hate (by people like you) have been aimed at us. We've got a tough path. We would rather accurate descriptions be shown, rather than shit like Chick Tracts.
But ive dealt with people like yourself who use shame and disgust when talking about sex. Ive also seen where that leads, and how utterly backwards and ignorant those adult children are. And that ignorance of sex is actually more dangerous than 'harming' their sensibilities.
Thats how you get rape and sexual assault, by not talking of consent. Thats how you get pregnancy, by not talking how sperm and eggs work. Thats how you get STDs, by not discussing sexual diseases and how to protect yourself from them.
At one job I worked at (food service), had a 19 year old woman think if she had sex standing up, the semen would run out of her vagina and she wouldnt get pregnant. 2 months later, she was pregnant.
Another job in food service I worked at hired a 18 year old lady who was heavily indoctrinated by extremist christian home schooling. She didnt even know the definition or how sex worked. Her parents kept it from her. She ended up asking her coworkers on breaks what it was about. We all recognized the severe harm done to her, and tried to help where we could. Questions she asked that we couldnt answer, we directed her to the public library. (These days, the cristian nationalist trash types dont even want that to be an avenue.)
The underlying theme with your comments and invoking shame points that you support the utterly failed approach of abstinence only education. Everywhere its tried is an abject failure. https://www.publichealth.columbia.edu/news/abstinence-only-e...
And Id say that you are harming your children more by arbitrary abstinence, than by actual education. Shocker image or no.