Yes, Polygamy is good. For example, For a married man, it is better to take a second, third or fourth wife than to involve himself in pornography, take a mistress, visit prostitutes etc. Similarly, it is a better option for women to be Married to a man forever than to be someone’s mistress or girlfriend. Marriage is a more permanent, longer lasting solution whilst the latter two options she can be brushed off and be dumped with a meager text message. Women prefer long term commitment and stability.
Therefore, Polygamy is good for both men and women.