Most parents do not have the technical skills to effectively limit that usage. The vast majority may not even be aware that software tools and features exist that could limit it. For that matter, I am aware, and the features on most products are insufficient... I shouldn't have to block Youtube at the router-level, but that's about the only thing I can do. Works for the Xbox, which is plugged into ethernet, but it won't work for the iPhone since it just does fallback to cell service. What's to stop the kid from buying some cheap Android device and swapping in their sim, so they can get around Apple's parental controls?

>except that today most 18 year old already lost their virginity, True when we were kids. But bizarrely less true today.