This was part of what puzzled me, I went to secondary school in the late 90s and how a girl shaved her muff was on the tame side of things that were said. I cant imiganine its got any better,While the reactions are a bit over the top, I do think it is fairly odd that a textbook chose to do that. Fundamentally though, it is not a big issue and if people think that teenage girls are getting pressure from biology text books they really haven't got a fucking clue about how the world works.
Besides that's a lot nicer to look at than a muff that hasn't been shaved ever like the ones we saw in text books
i'd hardly say its not normal for a woman to shave down there like some of these people are, certainly isnt "porn star" looking