http://www.goodtouchbadtouch.com/child-safety-at-home/talking-to-a-child-about-abuse
Children as young as four years old can understand the basic concepts of good touches, bad touches and confusing touches. These young children can also understand the definition of sexual abuse and are not afraid of the words that send a chill up the spines of adults. Use the words "sexual abuse" when talking with your child because if a child is victimized, they need to be able to tell you that they were "sexually abused!" Child protective services social workers will tell you that a child without the language to describe their victimization is a child whose case is weakened in the court system. Remember, you are not putting the responsibility on the child. Instead, you are helping the child to understand the problem and identify safe people who will support them!
Many years of experience, teaching thousands of children, have shown that children are not threatened by this information, they embrace it! It is so very evident in the classroom when we teach Good-Touch/Bad-Touch® that children are proud that they are learning how to take care of themselves. Teaching your child about sexual abuse further empowers your child to participate in his/her own body safety!
I don't know how you are even writing because this is not even my child and I am shaking.