I don't know what a reasonable solution is. We forbid selling alcohol & cigarettes to people under a certain age because we deem it unhealthy for children's development, but we don't have the tools to do that for internet porn on a societal scale. Is digital ID the right solution here? Is there a better way to do this? The HN mentality is to tear down digital walls, and is it even possible without seriously harming the open web or personal privacy & security?