The issue isn't entirely about the media and cultural influences on the mind.

Anglo-America now has probably the lowest age of menarche in the history of the human race, probably thanks to its peculiar diet, dietary phyto-oestrogens and gender-bending chemicals in plastics. At the same time, particularly in the US, legal constraints on sexual activity are imposed at a more advanced age than in any earlier human culture.

More than five years between sexual maturity and sexual legality, and people act surprised that there's a problem?