I respectfully disagree a bit with Platinum.
""women by nature like tend to be drawn to raising there children"
The women that have children often do tend to be raising them, yes. But with the birth control pill, as well as some erosion prejudice, there are many women that are content to not have children at all.
""which leads them not able to work as many hours as men.. making them more dependent to a certain degree ""
I don't necessarily agree with that. There are many situations where the husband simply does not earn enough to support the household, and the wife must earn something so the household stays solvent. In that situation, the husband is just as dependent on the wife.
"" YES it could go the other way around too... but generally speaking this is how its always been, and by nature how females are. ""
But women working isn't "how it's always been." That has been more recent. But if having children and staying home with them were how all females are...then there would be substantially less women in the workforce...as they would all be drawn to staying at home caring for their children.
""If you look at modern day society you will see that many women are drawn to a wealthy man (provider) and would care less if that man has a wife...so some women today jump into pural marages with both arms and legs without thinking of a males first wife.""
A woman in that situation is not fulfilling the role of a wife, she is fulfilling the role of a prostitute.
""the highly respectful Guru Arjan Dev, Guru Hargobind, Guru Hari Rai, and Guru Gobind Singh all had more then one wife ""
But the reasons behind it were not specifically (or exclusively) so a man can indulge himself sexually with more than one woman.
There was very little in those days for medicine, or medical care. Diseases were common...especially in hot climates. Life provided much more risk. Childbirth was risky. Children were paramount. Women did not have careers of their own, and sterile women were dismissed as useless.
In addition to the reasons sited by Dr. Gurbaksh Singh, polygamy had a very important role of ensuring perpetual children. It provided genetic diversity to fend off diseases and disorders. It is a fantastic solution.
And now, centuries later, the planet is feeling the strain of all of that genetic diversity. Two coutries where polygamy thrived for centuries, India and China, are now desoerately overcrowded with populations topping over 1,000,000,000 each.
But in modern times, we have much better medical care, many diseases are under control, and a very watchful eye is taken torwards reproductive habits. Or in China's case, a very legislative eye. There may have been a time, and a need, for polygamy. However, that time is likely not now.