Quote:
Originally Posted by CCIP
How do you know this? There is a lot of incestuous behaviour observed in nature and among primates particularly (just do a quick google search - there is a vast amount of academic material on this subject out there). What makes it unnatural, then, and how can we prove this? I'm afraid a lot of it is simply a common-sense assumption that the loss of genetic variety makes it unnatural, but in fact that in itself is pretty poor reasoning to justify the 'unnaturalness' of it alone.
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There is a lot of academic material pointing to a fact that incestuous behavior is damaging genetically.
Its not just about "unnaturalness" but it became as such due to observation and conclusions as well... hence ....social norm back up currently by science.
Observation and drawing conclusion is what derives us from other primates.