I thought it was pretty clear-cut. Don't touch a kid, regardless of whether you're attracted to them. Wouldn't force yourself on an adult, don't do it to a kid. Wouldn't manipulate an adult for sex (if you have any respect for others anyway), don't do it to a kid. As an adult, it's your job to teach children how to get by in the world and make sure they're happy and have fun growing up. Not take advantage of them and treat them like lesser beings.
Whe it comes to animals, don't fuck 'em. They can't really consent to it, so don't pin a puppy and fuck it up the arse.
In necrophilia, you can only do that if the person gives their consent before they die. Like "yeah, you can fuck my dead body." If not, you're still raping 'em.
When it comes to incest (as someone mentioned a few pages ago), as long as it's between two adults who give their consent there should be no issue. You've got no more a right to tell them they can't be together as you do telling a gay couple or an interracial couple of whatever they can't be together. Two able-minded adults have the right to be with whomever they so choose. Doesn't matter if you don't like it, it's not your life so fuck off.