Jealousy comes from someone wanting a partner to be mongoomous while they have a happy life of polygamy. That's why I said "polygamy for all". If we all did it, and it was accepted as the norm, then jealousy wouldn't be a factor.
These strange and weird ideas come from looking at nature.
Penguins mate for life. Do you ever look at them in nature? Many other animals mate for life as you well know so because you want everyone to have two or more wives is why you choose to neglet these other animals?