A human12

Leave whom? I'm simply asking a question for a reason that you actually don't know. I'm not of course looking for a justification to go have intercourse with a child. I won't even have before marriage.

Well, but I'm considering that there's a girl here that hasn't reached puberty, and very little physical force was applied. Can she be hurt on the physical side?

Are there any scientific papers that talk about the effects of intercourse on girls before puberty? I would like the consider that there's no force here. Just plain intercourse.