Yes. She will maintain that right—to reject content she finds morally reprehensible—throughout her entire life, of liberty holds up that long time. Even at university. It will be up to her to excercise that right as she discerns. And only her.
There are also experiences that some people think everyone should experience. And there are people who find some of those things to be morally reprehensible. They, also, maintain the right to reject those experiences. If they did not, some of those forced experiences would be a violation.
In the same vein, forced encounters with unwelcome sexually explicit material constitute an intellectual violation. So: yes. She should not be forced to read things like that. Ever. She also maintains the freedom to enjoy it. It should work both ways.
I never said school is about feel good books. I would like a book that does not contain sexually explicit material for my daughter who is a minor. So many great books are challenging and face all of these issues without the sexually explicit content.
Neuroscience and psychology would disagree that any adolescent child would benefit from sexually explicit material, especially the deviant themes. I suppose eventually the educators will catch up to science. Decreased age of first sexual encounter, increased number of sexual partners, dramatically increased incidence of sexual addictions. We have to protect children. When they are old enough, they can process these encounters in the appropriate areas of their brains. Not yet.