Re: how could this happen!?

Sandandconfused, please........don't go off the ramp over this.  It's NOT unusual for children to engage in "show me yours, and I'll show you mine" exploration.  Having said that, it also doesn't mean that you should ingore it, which you haven't.

First thing I would gently suggest is to stop using labels to identify your children.  I'm the POSTER CHILD for ADHD and, thank God, was growing up in a time when medication hadn't been applied as a management tool for a catchall phrase.

Second, I'm wondering if your children have properly processed your divorce.  When adults divorce, they know what the issues are, even if they won't acknowledge them.  Children, on the other hand, are often left feeling as if it is their fault on some level.  Proper counseling/therapy will address this.

Third, is it possible that your children (or, one of them) has been exposed to p 0 r n o g r a p h y or possibly have been molested by a neighbor, friend, or relative?  Again, a good counselor/therapist will be able to get some of this into the open without coersion. 

Take a deep breath, and relax.  Take ALL video game equipment OUT of the children's rooms - televisions, computers, consoles, etc., and move them into the general family area.  Set a limited amount of time that they can play these games without monopolizing the space for the rest of the family, and STICK TO THE SCHEDULE.  Finally, keep in mind that this behavior is just a symptom of something else and can be addressed.  This is not the end of the world.

Best wishes to you.