The "Go Ask Alice" Book of Answers:
A Guide to Good Physical, Sexual, and Emotional Health
by Columbia University's Health Education Program
This book is not strictly a parenting book - but every parent could benefit from being able to "Ask Alice" some of the many questions that arise in dealing with teenagers.
Unless a parent buries their head in the sand and pretends this stuff doesn't need to be dealt with, they will find this book to be an invaluable resource in responsibly guiding their teens through the danger-filled waters of relationships, sexuality, and sexual health.
This 300+ page answer-book is also loaded with information about other important life issues, including emotional health, fitness and nutrition, and alcohol, nicotine, and other drugs.
Note: This book is a printed resource based on the most popular health Q & A site.