There's a mass movement of people protesting this sort of content going on, and even all of you instinctively rejected the suggestion that any of these books are explicit material before pivoting to "they are and that's a good thing".
There's a "mass movement" of people who think women should not be able to vote. In a world containing billions of people who are all able to talk to one another almost instantaneously using technology, it is not hard to generate a mass movement for basically anything. That does not mean that said movements are actually capable of gaining serious traction, and it certainly doesn't mean that they have any intrinsic merit.
even all of you instinctively rejected the suggestion that any of these books are explicit material before pivoting to "they are and that's a good thing".
You have attempted to insinuate that the content of this book is pornographic. That its purpose is not educational but to cause sexual arousal or titillation. If that is the definition of "explicit material" you are using then the book does not contain explicit material. If the definition of "explicit material" is giving extremely general guidance to how to touch human bodies in a way that is pleasurable while emphasizing the importance of individual preference, comfort zones and emotional intimacy, then I will concede that the material is "explicit", but I don't think that means anything. It is also entirely age-appropriate.
You talk about "hedonism", but it's very clear in context you aren't actually referring to philosophical hedonism because I don't think you have any real counter arguments to that. What you're trying to capitalize on is a popular idea of hedonism as a position of selfishness, and in that sense you are correct. We do live in a profoundly selfish society. We live in a society where a tiny and shrinking number of people amass ever greater wealth and power and are able to live ever more extravagant lives of luxury (and sexual excess) while the rest of us are gradually reduced to figuratively or literally "servicing" them. We live in a society whose culture and media overwhelmingly reflects this fact, and which works to strip sex of any kind of intimacy in favor of reducing it to pleasure and power.
But the kind of sexual generosity which (for the most part) this book advocates doesn't really square with that idea of hedonism at all. It's not pornorgraphic and it's not self-indulgent, quite the opposite. It is written with the fundamental assumption that
you value the person you are having sex with enough to consider them worth the effort.