[ED]

Pest has already pointed out the things that I would have thought. Incest on a physical, scientific level certainly isn't a "wrong" - and correct me if I'm wrong but it certainly isn't illegal.

However, morally and socially it IS frowned upon. You "instinctively" know not to want to kiss or have sex with your siblings (and I'm not talking about 'exploring sexuality' as a child), it is a GUT feeling inside you that more than likely would be there had noone said anything regarding it.

And yea, it is just gross. I mean come on. If we're boiling it down to just sex, and physical act, then go jerk it. Sex and attraction ARENT what draw siblings together, or you to be drawn to a sibling. That's bs in my book. There's something ELSE there.