Michael Emberley's illustrations, like this one showing an egg traveling through a fallopian tube, make sexual health information accessible to an elementary and middle school audience. But elements of the art, including naked bodies, make some parents uncomfortable. Candlewick Press hide caption

itoggle caption Candlewick Press

Mountains of "little blue pills" and their chemical kin have transformed the way many people think about sex and aging. Raphael Gaillarde/Gamma-Rapho/Getty Images hide caption

itoggle caption Raphael Gaillarde/Gamma-Rapho/Getty Images

We know it's not really about Mr. Stork. But we might not be up to speed on key aspects of conception. Jens Bonnke/ImageZoo/Corbis hide caption

itoggle caption Jens Bonnke/ImageZoo/Corbis

Almost half of high-schoolers have had sexual intercourse, but teens almost never ask their doctors about sexual health. Nicole Young/iStockphoto hide caption

itoggle caption Nicole Young/iStockphoto