It's in the commandments.
1. The god of child sex is a strange god indeed. Your image of God must really be something that He's not if child molestation in the family is aok.
2. If that's what you're into, then it's in vain that you would take on His name.
3. You obviously haven't kept the sabbath in good thought when doing that stuff .
4. Whose parents does that bring honour to?
5. You've really cared less whether the kid goes on to live or die.
6. You've comitted adultery - against someone's spouse to be, or your own wife.
7. You've stolen something you can't even give back.
8. You've covered it up.
9. You've probably coveted someone's wife or husband to be.
10. You've coveted something that simply wasn't yours.