A friends who teaches first grade is talking with the children in class:
“I’ll explain to you how a genealogical tree is formed. First people get married, then they have children, and those children also have children. In this way new branches appear and the tree grows.”
A hand shoots up and one of the children exclaims, “Teacher! Teacher! Not all people have children.”
Before my friend has the time to respond a girl sitting in the first row yells out, “I know! A woman who doesn’t have children is called a virgin!”