These are public, tax-funded schools we're talking about here. Parents who really want their 10 year old to learn about BDSM practices or breast removal surgeries can still get them those books on their own dime.
In your option was Roots (https://en.wikipedia.org/wiki/Roots:_The_Saga_of_an_American...) teaching 10 years olds about BDSM practices or breast removal surgeries? That book was banned.
Thus the rest of 9999 books could easily have many on the subject.
> The toubob humiliate Kunta and the other captives by stripping them naked, examining them in every orifice and burning them with hot irons.