Re: Sibling Molestation
I read your responses and I have to stress the importance of your checking out the links provided - demanding to know what's going on and/or where he was exposed to the p 0 r n o g r a p h y will get you nowhere and this is clearly spelled out on one of the links that I provided for your benefit.
Your son has been exposed to hard-core p 0 r n o g r a p h y or sexually molested, plain and simple. He didn't invent oral sex in his imagination and he has either seen hard core p 0 r n videos (his instruction to his sister supports this theory), and/or he has been sexually molested. Again, I cannot stress enough how damaged both children are, at this point - getting IMMEDIATE counseling/therapy for those children with an abuse specialist is imperative to attempt to piece together their tender psyches. They have each had their innocence destroyed, the son has obviously seen (and, possibly been forced to participate in) SOMETHING that he ought not to have, and they are both going to "act-out" this exposure through more inappropriate sexual means and other very serious behavioral problems.
You mentioned that you sent your son to a camp? Was this recent? If so, Christian or not, someone at that camp could easily have molested him and used p 0 r n o g r a p h y as a catalyst to do so, thus the sudden onset of this extremely disturbing sexual behavior. However, it is not uncommon for children to experience delayed reactions to sexual exploitation or exposure to p 0 r n - it's termed Post Traumatic Stress Syndrome. Your son's behavior is NOT, NOT, NOT within the normal boundaries of "Playing Doctor" or exploring each other's genitalia - it is a clear, definite, and screaming symptom of something much darker and deeper in origin.
You are all in my prayers - best wishes to you.