Discussion forums for Minor-Attracted People and allies
http://forum.map-union.org/
Once y (positive experiences) ≥ 60–70%, and harm can be mitigated through better norms, education, and exit options, then criminalization becomes unjustifiable.
Especially if most trauma is reactive—caused by shame, secrecy, or betrayal—then the moral focus should shift to changing conditions, not outlawing the act entirely.
But if x (negative experiences) > 40%, and especially if the harms are deep or unpredictable, a strong presumption against permission still holds, unless an effective system for harm prevention and complaint-based redress is in place.