[throwaway59601]

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.