You know, maybe inter-species isn't so bad.
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[Edited by Latiosmaster47, 5/1/2010 5:58:19 PM]
I don't think Incest should be illegal per se, just discouraged. Consent between adults is consent between adults. I'm actually quite fond of the whole "Twincest is Wincest" thing within the fandom, and a LOT of good stories and artwork depict twins discovering their feelings for each other.
I'm pretty sure incest should be illegal. "Discouraging" something won't stop it, especially without any punishment. No one wants the amount of mentally challenged people to increase, that's why some governments try to keep them from breeding. If incest were made legal, all those efforts might very well be neutralized.