Why emphasise on monogamy?

[Homeless Nutter]

If we biologically were are programmed to want more partners, and even dissatisfied with one partner over time (biologically that is), why emphasise on monogamy?

Let me lay down the math for you. In modern societies the number of males and females, who reach adulthood is roughly the same - there are slightly more girls born (~2%), especially in families with large numbers of children, probably due to woman's uterus becoming more hostile to male fetuses after each son. Roughly 2% of each gender are gay or bisexual. That means that there is roughly 1 heterosexual man to 1,02 heterosexual women. If some greedy horny f*cker decided to have 4, 6, or 32 wives - that would mean a significant number of males in the community would have to be without a partner. 

Now, in primitive, sexist, warring societies - like most traditional islamic ones - there's a significant surplus of women, because men (usually from a fairly young age) are the only ones actively participating in wars, as well as the ones most endangered by poor working conditions, or traffic accidents - as women can't serve in the military, work, or drive. Because of that difference in numbers - it's more feasible for one dude to have a harem. Also - insufficient number of available sexual partners created by rich people marrying more than their fair share of women, is useful for creating sexually frustrated young men, which can be easily motivated to do all sorts of grizzly sh*t, for the promise of a p*ssy - even if it's in the afterlife...