Child Adolescent Sexual Development: Infant and Preschool
This is a very comprehensive lesson on infant and preschool sexual development. It says only one class period, but I think it could be several days worth of materials to cover. The point of view taken here is from that of being a parent. Learning about what is normal sexual development in infants and young children is important. These facts will be helpful when it's time to plan for one's own family and how to handle these situations when they occur.