Well forever will only be about 20 years now, so doesn't seem so bad

I have trouble with the "meant" part of the question. you mean are humans hard-wired for monogamy? probably to an extent, but with our supposed sentience, we tend to wander off, so to speak. marriage, of course, is just an arrangement. through most of history it was an economic one. if that is no longer an important reason for marriage, then marriage is redefined.

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The purpose of Marriage is to create a stable financial and emotional contract that allows you to birth and raise children. The problem with the Christian idea of Marriage is that people are encouraged to commit to this arrangement before they know themselves. That really does not matter however, because religions are only concerned about procreation, about creating new members, and they care nothing for self knowledge or fulfillment......As for your other question, are we meant to practice monogamy? As a species (Primates), reproduction does not require life long pair bonding; in most primate groups, there is a dominant male who does all the breeding, so you can see that our concept of marriage has been changed by culture.....Until just recently, men could have as many wives as they could afford, and so they were not frustrated by the constraints of fidelity. I also think that the Nuclear family is unstable and is producing low quality children, so we will see what happens.