12 years is too early to be accessing porn. I remember in High School there was a bunch of kids in C.U who you could tell graduated without ever getting involved in vices like drinking, smoking, sex or even porn. I think things go south after high school for a majority of people because uni is just a free fall.
That’s why it’s important you equip your kids to handle the pressures during school and later on in their young adult life 19-23.