@Happily_Grim
How do you think she could see something like that on a friend's cell phone? At school she is seen as a super serious person, and even if she could see it at home, her mother would find out at some point, considering how serious she is about this subject.
She could hardly visit any place that sells sexual products or anything, since she would be as much ashamed as she was afraid, since if she were seen by someone buying things like that, she would have some kind of punishment at school and would reach her parents. It's Japan, after all.
(Besides the fact that she is not of legal age.)