Polycarp,

“Bigamy.. is illegal...because it is considered 'wrong'”

In a secular world consenting adults make their decisions individually. Whether its same gender or polygamy, bigamy, polyandry, poultry or Polycarp (just keeping the rhyme).

Back to Horus example above, the 100,000 cases of Polygamy are the known cases in the same culture and religiou belief system,. So does that mean there are few ‘million’ hidden cases?

As for the sperm bank, whatever you call it the impact is the same: different females raising families from a single 'virtual' male. All receiving support (financial & medical) by the system.

Peace,