Is it morally wrong? Brother - sister, aunt - nephew, uncle - niece; all perfectly cool in my book so long as babies are not being made and everyone is legal and consenting because, hey, they ain't hurting anyone. Mother - son, father - daughter however is a bit less so, not that it's truly awful it's just not quite as morally grey...
Should it be banned? Maybe not outright, but it should be frowned upon and doing it without protection should be very illegal.
Does it disgust me? No, not really, so long as there's no offspring and it's... Clean. If I found out a friend was fucking his sister I'd be fine with it. Hell, if I had a sister that was attractive, legal age and consenting I wouldn't be totally against it...
Should it be banned? Maybe not outright, but it should be frowned upon and doing it without protection should be very illegal.
Does it disgust me? No, not really, so long as there's no offspring and it's... Clean. If I found out a friend was fucking his sister I'd be fine with it. Hell, if I had a sister that was attractive, legal age and consenting I wouldn't be totally against it...