I hate to break it to you but most teens have heard of fisting (and other acts) well before they reach 15/16.
Oh FFS. It's not about what they've heard of or what they haven't.
Read Stephanie DA's thread above. Those are the facts on the ground. Girls are being coerced into sex they neither like nor want. The rate of impotence in young men has increased from 2% to 30% because they're all pornsick and can't get a hard on. This is not sex positive, for fucks sake. This is not the healthy sexual future we want for our children.
Why are you supporting grooming them into this hellscape instead of sensible curricula that enable them to find ways to create mutually-fulfilling, sustainable sex lives that actually give them lasting pleasure?
A healthy sex life isn't a fucking video game where you chase achievements. Nothing sex positive about that.