And consentual sex with a child is illegal because the age of consent implies that people under that age do not have the ability to control their surroundings and depending on age have no concept of sex. A parent could abuse them, and what are they going to do? Go home? An adult figure has ultimate authority, and if he told the child to tell everyone else that the child said it was okay, the child would do it even if it wasn't true. Also, physical sexual maturity occurs before mental sexual maturity, and if something occurs during development like that, it can be detrimental to the child's emotional and psychological well being.
Edit---Furthermore, I see no reason to PM you, this conversation fits well within the boundaries of this topic, and I have no intention of becoming offensive.
