I know you won’t mind this, Laura, so I’ll tell you about a Christian series that I think is fantastic from Concordia Publishing House (www.cph.org I believe!): it’s called the "Learning About Sex" series. There are books everywhere from age 3 or 4 - when they start noticing that boys and girls are different - up to teens (talking about the dangers of pornography, STD’s etc.); there’s even one specifically for parents, and how to talk about sex if you’re uncomfortable with the whole idea! I have them all, and have used them for both my kids since they were about 3, and asked about different body parts, etc.; it’s all from a Christian perspective, and I highly recommend the whole series. Blessings!