Teaching your children about the birds and the bees demands a gentle, continuous flow of information that should begin as early as possible. For instance, when teaching your toddler about his fingers and toes, and their functions, do include information about their genitalia.
As your child grows, you can continue his education by adding more materials gradually. Soon enough you'll have created an open bond and communication with your child, so that when he reaches his teenage years, he won't be shy to talk to you about sex.