I must say I was disappointed in this book. We had read the earlier two books to our children and had found them very useful and appropriate. This book, on the other hand, missed the mark.
One example would be where the boy and the father are discussing why it is wrong for a boy to have pictures of naked or half-naked women plastered around his room. The answer given is right out of the liberal/secular playbook: objectification. This answer is not only illogical, it is not Biblical. Ironically the answer to this question can be given with a direct quote from no lesser personality than Christ himself. "If a man look at a woman to lust after her," Christ tells us, "He has committed adultery in his heart."
So the father should not only have quoted Christ but have explained to his son that, as we as a church are to preserve ourselves chaste virgins for Christ, so those women should be preserving themselves for their own husbands, and his son for his own wife.
Time and time again the book raises important questions only to answer them with a secular/liberal answer instead of a Christian one. 'Unwanted pregnancies' are spoken of instead of fornication, as if the real problem was that the woman might get pregnant, not that she was prostituting her body in a relationship with a man not her husband. Most blasphemously of all the subject of abortion is addressed as if it were just a 'difficult decision' instead of an act of murder.
Other reviewers have addressed the age issue and I believe they have dramatically missed the mark. Sex education, especially if addressed in a Christian and frank manner, using the medically correct terms, is best started very early. For our very young children much of what adults do is incomprehensible anyway, and so sex is just one more incomprehensible thing. They can be told, and accept with joy, the idea that Mommy and Daddy enjoy each other in a sexual way. They can learn how babies come out, and how they get in there, without any of the discomfort that faces the older child.
It is the older child, in whose body had begun to stir a curiosity, moving to a fascination, for what their body and the body of another might do to another, that introducing the sexual act might cause extreme embarrassment. Or the concept that their parents still enjoy these activities (which, hopefully, should be obvious anyway, as new children keep arising and Daddy makes his physical affection for Mommy clear) might lead them to be 'grossed out'.
And the parents should be careful to deal with this issue of being 'grossed out'. One of the goals of Christian sex education should be to reflect the view of Song of Solomon, Proverbs 5, and Ephesians 5, that the physical union of a man and a woman in marriage is a marvelous, necessary, and spiritual thing. That in so doing they reflect the relationship between Christ and the Church. That the child should not be 'grossed out' at the idea of the sexual act, or embarrassed that his parents should, and do, continue to enjoy sex.
All in all this book represents a great missed opportunity to preach the Gospel of Christ to a lost world through the medium of sex education, and deceives Christian young people on exceedingly important issues.