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Incest is a topic I hadn't thought of when I first posted. Freud would say (Civilization and its Discontents) - and this applies to some of these other topics as well - that the "ick factor" towards incest evolved over time for the stability of civilization. That said, I think immediate family is the only one that people are genetically predisposed to find repulsive. Socially, cousins have also filled into that category, but there are plenty of cultures in which relations with a cousin isn't totally unheard of. The idea of relations between a brother and sister is MUCH more rare.
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Le temps détruit tout
"Musicians are the carriers and communicators of spirit in the most immediate sense." - Kurt Elling
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