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Heinlein:
1) Sex with Mom - Time Enough for Love
2) Old guy, new body - I Will Fear No Evil
To re-intellectualize the situation:
-Sex with Mom is no biggie
-Offspring with Mom is a serious biggie
-Church (the first large ingroup structure, religious preferrence irrelevant) says, "Ok, no more two headed children with gills and the same father/brother." follows that statement up with, "Ok, if you do, you're immortal soul (or other appropriate irreplaceable spiritual component) is damned/cursed/etc."
That should just about cover the valid reason for not doing it as well as the root of the ick factor.
Did I leave anything out?
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I have gained this from philosophy: that I do without being commanded what others do only from fear of the law. - Aristotle
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