explained

Now explain to me what the difference is. No, I do not in any way justify the fellow criminals, but I do not see the difference between the "two minors petting and enjoying" and "a minor and an adult petting and enjoying." What’s the difference in the size of the genitals?? to
For an analogy - two children played in a Lego designer and a uncle and his nephews played in a Lego designer. and one Fig.

The difference is in thinking, not in the size of the genitals. The child thinks in the categories of the game, until a certain age for them everything is not serious and "the scam is to blame, and not me". The child cannot fully calculate the outcome of careless actions. And the adult is fully aware of the consequences of his actions and the partner. Such as physical injury, pregnancy, social consequences for the child, his psychological changes (the same Stockholm syndrome, misjudgments about sex) and so on. Do not forget about the difference in physiological formation. Not all the pleasures received by an adult are available to a child.