how do you know about this
there's a whole onion website dedicated to child research actors and their names. either way, it's not relevant as a statistic but more of an example.
if you want to know why people do this, it's because children are vulnerable to ideas. i'm not going to dig through the 100000 abstracts that exist on child psychology because it should be well understood by now. it's the same reason why gambling requires an age limit. same reason why smoking, alcohol, driving, and every other potentially dangerous activity or mindset that people tend to abuse is restricted to smarter, more mature audiences.
the government isn't afraid of teens jerking their meat or fiddling with their clit. they couldn't care less about that. they mainly care about the potential prostitution it may cause, especially when combined with the lack of love education. there's so many issues that arise due to lack of love education, including diseases, unwanted pregnancy, rape, and a whole other slew of problems. if parents want to let their child be exposed to research, they will manually verify it themselves. it's 100x better than them stumbling across researchographic content by themselves