The answer you give him should be careful, brief and affirmative, without the slightest hesitation.I don't need to emphasize it, but tell the truth.Adults don't realize the harm of lying to children.As long as a teacher tells a lie, his educational achievements will be ruined.Total ignorance of some things may be all right for children, but those that cannot be kept from them forever should be told early on.Either deny them curiosity, or satisfy them before it gets of a certain age and becomes harmful.To guide a student, to a large extent you have to look at his personal situation, his social environment, the social position he seeks for himself, and so on.Leave nothing to chance, and if you cannot be sure to keep him ignorant of both sexes until he is sixteen, let him know before he is ten.