Your choices are to have your son think his father is a criminal pervert, or realize just how hot Mom was when she was 14 years old just like him! How can Google effectively censor one country without removing legal content from another? Attempts to legislate an age of consent, while well intentioned, are crude instruments to put up against this powerful force.
Attacking Google would simply encourage these people to use other, less obvious, means of finding and sharing material.
Except the facts are on my side, if you are just willing to look.