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"Responsible people take all care possible not to have disabled child...And with siblings it is a great possibility. So no excuses."

No, it's a slightly less highly unlikely possibility. But still much less likely than for someone who simply has one case in his family and marries a stranger.

So if that's the argument against sex between siblings, the same logic would exclude all relatives of someone who has a genetic disorder to be barred from having children.

Incest is in the mind rather than in the genes. The risks are overwhelmingly psychological, which is why adopted children don't tend to make couples, and actually the law prohibits it. Whereas most cultures accept marriage between double cousins (but ban the more distant uncle/niece or aunt/nephew), who are genetically exactly as close as siblings.

Earth provides enough to satisfy every man's need, but not every man's greed. Gandhi

by Cyrille (cyrillev domain yahoo.fr) on Thu Nov 8th, 2012 at 03:16:38 AM EST
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I am not underestimating psychological risks at all.You are right about it. But genetic risk is also reality.
In my culture this is simply NO-NO. We tend to make our children know even very far relatives so if they meet each other later in life they are aware who they are. I know that not every culture is against it...some even has it as desirable in order to save family wealth.  
by vbo on Thu Nov 8th, 2012 at 04:05:51 AM EST
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I think the perception of risks comes from a time with smaller societies and worse communications. It then made sense to try to get together with one of those you were least related to.

Long time ago I read an historical study on a small finnish society that in the 19th century started their own school for children with mental disorders. In the 20th century enrollment suddenly drops and eventually the school is closed. About ten years earlier mopeds had been introduced on a large scale, widening the radius for connections. Genetical factor strongly suspected.

Sweden's finest (and perhaps only) collaborative, leftist e-newspaper Synapze.se

by A swedish kind of death on Thu Nov 8th, 2012 at 05:28:29 AM EST
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