I bought this for a friend who was having difficulty explaining the changes at puberty to her son after buying it for my son years ago. Not only does it explain the physical changes in a no nonsense way, it explores the emotional and psychological issues associated with moving from the child to the man, an aspect often forgotten or simply mentioned in passing by other texts on the subject.
I've no doubt that there are many more scientific texts available but this one is aimed at the boy/young man market and delivers the appropriate style of humour to reach its intended audience! My son found it gripping even though his reading was punctuated by many exclamations of "ugh", "oh, gross!" and "I'll NEVER do THAT!"
Quite simply this book goes where mothers (and fathers) fear to tread!