One that seems to be off of your main thread.
I agree that "trauma" depends on the people involved, the circumstances, the results, and lots of similar things.
What I was attempting to address was the issue of whether a child (maybe not physically, maybe even not mentally, but perhaps emotionally a child) can give "consent". (You said, earlier in the thread, "I DO NOT believe it is traumatic when both partners consent, however.") The law usually says no. E.g. a child can't legally enter into (most?) contracts. They usually regarded under the law as being in need of protection.
I think we all know that children can be fairly easily manipulated, and are capable of manipulating each other to consent to do things that aren't in their interest. Simply saying that they each consented doesn't address the issue of whether the consent was freely given, etc., or whether it can be reasonably given by someone who is too young.
So you're concentrating on the trauma, I'm concentrating on the consent.
My $0.02.
Cheers,
Scott.