To be honest, it's only because this is a manga that lewdness is being discussed this early. It's not safe or pragmatic to do it this early, especially in Japan or other oligarchic western country with crushing study and work hours and little financial stability.
It's why birth rates and teenage sex and pregnancy are down worldwide in OECD nations, and why so many young people intentionally refuse to have children (and often serious relationships) well into their 20's. They correctly realize that it would mean the end of their freedom (and sometimes happiness), and lead to crushing debt.
The way young workers and college grads are treated in the USA and the West is already bad, it's worse in Asia. Companies using more AI is only making things so much worse.