CanadianJeff CanadianJeff:
Actually with polygamy you have multiple people of one gender mating with one person of another gender. You cut the gene pool on one side of the gender for all those kids down by quite a bit.
Polygamy is inbreeding. If you have 20 men mate with a single female you shrink the gene pool compared to 20 men mating with 20 females.
We don't allow polygamy and incest for these reasons.
Not to mention that the closer in the blood line the incestual parents of a child are, the more likely the child will be born with some VERY serious birth defects. And I mean those extra special fucked up kind that rarely if ever appear except in cases of incest.