ch9: was there now some nice incest ??
the incest taboo imo is overrated. basically, the biology takes care of that to the extent it needs: the Westermarck effect. Meaning, one (if not seriously mentally disturbed) does not want sex with one whom has been growing together at a critical age on say 0.7 years. That's it. The phenomenon is called 'imprinting'.
Because that means that MOST cases of too close relatives are not sexual partners: usually, siblings, pergaps some first cousins, and often siblings of one's parents and children of one's siblings. The 'most' is sufficient, because in long term, an occasional breeding in incestuous pairing, does not add very much to genetical risks - as opposed to repeated over generations.
Genetically, sex (and progeny) with such relatives who are not blood relations, does not mean any danger on account of kinship. So, no sense to obstacle it.
And that all, basically, is what should be the limits: if one does stomach sex with a related person, then it should not be taboo - provided the other one does want it, too.
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everything negative what is talked in this thread, actually goes more to the perception of inter-generational sex, than to real incest...
because, Matt is not blood-related to discussed persons, nor has he grown with them at the age of 0-7...