I remember reading something once that said our family members produce a "smell" that is sexually unattractive to us so that we don't want to have sexual relationships with them.
It's not my cup of tea, but I wouldn't judge anyone's decision to do it. If they are mutually loving, happy and careful (as far as reproducing), then good for them. I can't say that I think it would be a very emotionally healthy thing for most people to do (at least between close family like brothers and sisters). I would assume that there would be a lot of guilt and other emotional issues accompanying incest that I wouldn't want to invite into my life.
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