Yes, just like the “Just Say No” campaign completely stopped children from using drugs and parents telling children to “save themselves until marriage” stop children from having sex.
That confirms my point - I'm saying that restriction, blocking access or making it a tabu never works, it does the exact opposite (and worse, because it builds a sense of urgency to have/experience the thing).
Instead of forbidding it, you have to teach the children about the actual dangers of doing the thing and how to do it safely, how to limit the damage and what are the limits they shouldn't cross - and the reasons for these limits.
Telling them "just say no" or "you have to wait until marriage" only makes them even more curious, and in many cases they will absolutely overdo it once they finally are out of the reach of their parents.
I agree with both you and the parent. Early on it's good to have restrictions, then phase them out as they're ready. At some point they need to be prepared to function on their own. Otherwise you might end up with 18 year olds acting like 12 year olds.
Instead of forbidding it, you have to teach the children about the actual dangers of doing the thing and how to do it safely, how to limit the damage and what are the limits they shouldn't cross - and the reasons for these limits.
Telling them "just say no" or "you have to wait until marriage" only makes them even more curious, and in many cases they will absolutely overdo it once they finally are out of the reach of their parents.