If you have a child who is nearing puberty, here are 2 book recommendations specifically for you.Changing You: A Guide to Body Changes and Sexuality
It's So Amazing by Robie Harris & Michael Emberley is my favorite book for puberty information, particularly if the child already knows some information and is now ready for more depth. The authors do a great job of covering a wide variety of topics, and do so with respect, pragmatism, and openness.
And for parents, I recommend From Diapers to Dating. It's a reference source and guide for all sorts of information about children and sexuality and development. The author is a minister, interestingly, and does address how to share your family values about sexuality with your kids as well.
There are many other good books, but these are my favorites. Happy Reading!