I believe this statement sums up my sentiments to the very word.El Danny said:What's that? You don't think your kids should be playing this game?
Don't Buy It For Them Then. Problem Sorted.
Stop having tantrums when the rest of the world refuses to parent your children for them.
Your kids want to have sex at 13? They'll do it. If a videogame encourages it, and despite your protests or life lessons, they just do it, then congratulations!
You're a bad parent.
Either that or it wasn't too harmful to them to begin with.