Yes, comprehensive sex education is indeed a valuable tool, but it's not the only tool. Nikhil's story, while not providing evidence that sex education should not be taught in schools, does provide evidence of why it's important that kids have access to other avenues of learning about sex. After all, parents and teachers can only provide so much information, and having other sources of knowledge can prove to be more meaningful and memorable for young people.
Furthermore, the Rhinoceros-Uterus volume that Nikhil accessed provided him with information in a digestible and age-appropriate way. It exposed him to the concept of sex in a way that allowed him to understand it without feeling overwhelmed. Schools may teach comprehensive sex education, but books, magazines, and other sources of media are still an important part of understanding and exploring sex.
Finally, while comprehensive sex education is important and necessary, there is something to be said for the forbidden knowledge that Nikhil gained via the Rhinoceros-Uterus volume. This knowledge was special because it was something he had to seek out on his own and discover in his own way. It gave him a sense of empowerment and control over his own understanding of sex, which is something that kids should be allowed to experience as they learn about this topic. Sex education should not only be taught in schools; it should also be encouraged outside of the classroom.