The most a device maker should be implementing is looking for RTA headers and then checking what options the device owner/purchaser set. This is not in any way

The most a device maker should be implementing is looking for RTA headers and then checking what options the device owner/purchaser set. This is not in any way a new concept. Implement child accounts and implement checks for RTA headers. This delegates the responsibility entirely to the device owner to raise their own children and website operators to set a simple header. This would be trivial to implement on both ends. Child visits site, device prompts for device owner password, then prompts to allow the site temporarily or permanently. If a website is serving user-generated or adult content and not adding RTA headers then fine the crap out of them once the corresponding legislation is in place. There is financial incentive for governments to do this correctly and to create very simple laws and device manufacturers to implement very simple technology. This will not stop people from sexting each other. Sexting would have to be addressed in parental controls on the device as to whether or not multimedia content is allowed to be received or sent to/from the device. Obviously a device owner that does not have children would never be subject to such restrictions.