Comment Temporary workaround (Score 1) 81
On phone unlock and frequently thereafter, have the user prove they are over 18.
If they can't or won't, then the phone reverts to "text only" mode, where the only images you see are those provided by the OS or compiled in the apps. Web sites load with placeholder images. Images stored in the camera roll and in the SMS app are replaced with placeholders. The camera is turned off. You get the idea.
I call it a "temporary workaround" because ideally it will result in a political compromise.