That's not how it works. A country is a state, a society. It needs to protect it's citizens to be able to function properly. This includes protecting minors above all and protecting citizens from predatory behaviour. You are part of a society, you don't live "by yourself". People in society help protect each other. It's how we survived, and it's why they exist.
You're telling me that in order for humans to survive, we have to tell each other what leisure activities were allowed to engage in? That's a load of crap.