Communication of information is important, but communication of values and feelings are equally important. Children learn by observation. Even if you don't say a word about sexuality, your children learn about sexuality by observing family patterns concerning affection, sex roles, etc. Your children hear and learn about sexuality from lots of different sources. You will need to clarify, repeat and build on your child's knowledge as she or he grows and matures.
Language is important.
Give your child the vocabulary the she or he needs to continue to ask for information. Use the proper terms for reproductive parts of the body. When talking with your child about sexuality, it is important to listen too. It helps you know what he or she is thinking and what additional information may need to be discussed. Make a commitment.