Your Moralising Quotient is: 0.17.
Your Interference Factor is: 0.20.
Your Universalising Factor is: 0.00.
I think this poll is unrevealing. We are trapped into the subjectivity of our own society's mores, are we not? While I can see that the absolute morality value of having sex between brother and sister is not there (if nobody was hurt, they counted it a positive experience). But the fact is, in the culture I was raised in, I would find it repugnant. If I caught my own son and daughter doing it, I would probably have a meltdown.
In my culture, I am taught that sex with a sibling is repugnant, that sex with a chicken is perverted (and wouldn't that freeze your willy?

) that eating a dead pet is just plumb nasty. I can't shake it without a great deal of effort, and frankly, I can't view it without a knee-jerk reaction of revulsion; not because it's "wrong" but because I was raised to believe that it is simply not acceptable.
HOWEVER, in some cultures (ancient Egypt springs to mind), it was perfectly acceptable for the Queen to marry her brother, and to produce children from that marriage! In ancient Greece, an adult man having sex with a young boy was not only acceptable, it was considered quite an honor for the boy. In some cultures even today, people treat their pet cats and dogs like the animals they are, instead of like little furry children; therefore eating them would not be beyond the pale.
I don't think the poll can reflect that, and I don't think our answers are illuminating (my own, either), because it's not really measuring our "morality" but more how well we have adapted to or overcome the ingrained training of life in our cultures.