Guys, I need an input and it could be an interesting discussion, so please contribute your opinions on those specific questions.
Disregarding the social moores (for this discussion), there are advantages and costs for all involved.
Starting from least obvious (at least as far as public opinion in US is concerned), what are:
a) Advantages of polygamy to participating women.
1. Woman does not have to settle for a second-rate male as a husband and a father of her children because the best ones are taken. Desirable men often display wilingness to have more then one woman in their lives, so that is not a problem.
Woman can excercise more discretion over selection of a father and an environment to grow her children and a choice is usualy a good thing.
2. Woman gets a more stable/lasting marriage - if she does not entirely satisfy her husband in some respect, he is much less likely to dump in favor of another woman. Even a woman is infertile, she may be a valuable and happy member of a family.
3. Besides being fathered by a more desirable man, woman's children are likely to benefit in life from having more siblings.
4. Children receive better care. (Tac)
b) Advantages of polygamy to a man.
1. Having more children.
2. Having more stable marriage, smaller temptation to switch partners - same as a woman.
3. Children receive better care - same as for a woman.
c) Costs/disadvantages of polygamy to any participants.
1. Less sex per woman?
d) Advantages of polygamy to society.
1. Children grow up in more suitable environments. If more then one woman is willing to join a marriage, there must be something good about it.
2. Healthier, smarter children - for both genetical and nurturing reasons - following from better woman's choice.
3. May encourage having fewer children per women which helps if overpopulation is an issue.
e) Disadvantages of polygamy to society.
1. Surplus of males which can create some social tensions.
2. Tac: May encourage larger families which is a problem if overpopulation is present.
3. Sligh reduction in genetic diversity
I have some opinions but would like to hear yours first.
I will update this post filling in the examples in blue
miko