Now for something Controversial... Incest is ok as long as they're not brother/sister.
Agreed.
No. Just no. It just squicks me out to a major degree.
You, of all people, are the one grossed out by this?
Dude, I am seriously fucked up in a lot of ways. But there are a few NO zones, one of which is incest. Hell, we should just make a Pr0n thread before this gets out of hand.