The discussion noted that the book discussed using "toys". They also noted that there was an add for buying sex toys as part of the book. These are elements that really caught my attention.
I have a hard time seeing most parents in the US being ok with this material being put in front of kids who are 5-10 years old.
But when you dig a little farther most of that stuff's usually handled just fine at the school or district level. There's very little justification for involving state or even county level government in addressing things like inappropriate lessons or content, because they do happen but are not an actual systemic problem because they're already dealt with by the existing, very-local systems.
If you want to prevent any "sexualization" content from reaching your young readers, you pretty much have to limit them to Go Dog Go.
What book was it?
I ask because the first real science fiction book that I ever read, that inspired a life-long love for the genre, and which I read under the age of ten, was Rendezvous With Rama, which did contain a sex scene. And the presence of said sex scene didn't traumatize me or anything; I mostly just didn't understand it. Certainly not worth preventing me from having access to that book in its entirety over!