It's not inconceivable it could be entirely initiated by, and beneficial for, a child. Many pre-teen children explore consensual sexual interaction, especially with siblings.
Lol, just reminds me of some themes in brave new world.
It depends on the classification of 'child'. As said before a child is basically when a person is not fully devloped physically, mentally or emotionally. Its easy enough to tell when a person is physically mature, but mentally or emotionally are harder to gauge, which is why we lable an 'adult' as someone above the age of 18, which is a point when a majority of people are supposed to be mature. Of course some people may be compeltely mature at 14, or may take until 30, but you go for the large majority.
And, as said before, a person without a full mental and emotional capacity is unlikely to make the 'right' decision as to what they do. This is why , until a person is of a sufficent age, we have parents and guardians to take care of us and make the decisions which could effect our lives most. By this reasoning the only case in which it is acceptable to have sexual relations with a child is with parental consent- but as, said before, humans have a massive desire to protect their children, this is unlikely to happen. And if a parent would consent, under most circumstances they would not be protecting their children, causing them possible harm, especially if a child does not wish for the act to happen. A parent, in most of these cases is unsuited to the role of caring for children.
Personally, my belief is that sexual relations with children is wrong, the only exception I would take to that is that of two kids of roughly the same age and decelopement.
Are these just ideas forced on me by society? Maybe. But does this mean that these ideas are wrong just because I've been taught them? Probably not. Its true that some social conventions are not right, but I'm willing to bet in most cases they are.