My friend used to work at preparatory school. At the school, he was asked whether he had sweetheart or not by a female junior high school student. He replied he had never had sweetheart. The student made an irresponsible remark. That is "You must be weird on that you are virgin."
He resisted by saying "Shut up! Immoral girl!"
It is the serious problem that young girls such as the junior high school student has already had sexual intercourse with male(s) without having enough sex knowledge.
Conservative people often say that sex education should not be included in elementary school curriculms. But, when we consider that it would be easy for children to acess the websites scattering wrong inforwation about sex, we have to educate them as early as we can.