Despite what my wife's magazines might have us believe, I understand that generally we're genetically programmed not to fancy people who are closely related to us.
I think it's nurture, not nature, that stops us fancying our siblings. There was the rather tragic story of the German brother and sister who were "seperated at birth" ( or very soon after), grew up seperately and then met by chance as adults and fell in love, only to discover theri relationship
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