I suspect that Sassy may have been referring to her own experiences as a growing girl and to the relationship between someone who was once a growing girl and her daughter.
In general, I agree with her.
I don't really know what it is like to be an adolescent today, I hope that sex is not demonised in the way that it was when I was young but treated in a more open, everyday manner, and that rationality is used instead of either hellfire or social derision to dissuade young people from sexual experimentation. The current legal framework was probably established a long time ago. Since then there has been a reduction in the age of menarche (not necessarily the same as first ovulation) - it is probably more productive to consider adolescent girls not as children but developing women.
I believe that young people should be encouraged to be comfortable with and within their bodies, and that, for example, masturbation is not demonised.