Do you think Incest is gross? Why?

Anonymous
Don't give biological reasons.
I know that there are chances of birth defects in the offspring.
Do you think its gross because society, a book or the law or your 'inner self' says its bad?
Royal families often resort to incest to keep the bloodline pure, would you still call it wrong/gross/bad?
I'm not talking about parent and child intimacy. I don't like it at all.
Updates:
+1 y
I'm not saying that you should make babies with your sisters, that obviously will be disastrous.
Do you think Incest is gross? Why?
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