We shouldn’t be giving 6 year olds access to call of duty or GTA either. PEGI ratings (although overzealous) are a god starting point. I wouldn’t withhold an average 10 year old from a 12 rated game, but I wouldn’t give them access to an 18+.

Also, we (usually) talk about these things - video games are not the only source of discourse of violence or conflict, but sex is such a taboo topic that it’s highly likely most or all of someone’s knowledge will come from what they’ve learned on the internet