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I actually specifically believe that monogamy is a natural relationship for humans (though not all) -- as organisms that reproduce with a quality of quantity 'strategy', investing 2 parents in the care of the off spring is effective. But
I actually specifically believe that monogamy is a natural relationship for humans (though not all) -- as organisms that reproduce with a quality of quantity 'strategy', investing 2 parents in the care of the off spring is effective. But culture plays a strong role and certainly the definition of '2 parents' is subjective. I wouldn't judge anyone's choices, I just think it makes sense and is seen in many other animals.
Here is the thing what your describing isn't monogamy, it's pair-bonding. Pair-bonding is not the same as monogamy, i.e. extra-pair couplings are extremely common among pair-bonding animals, although in human terms we would call that "cheating". To put the difference in more human terms wife-swappers are non-monogamous but still pair bonded. The cultural concept we call (monogamy pair-bonding with complete sexual exclusivity by both partners) describes a rare mating strategy among animals, while pair-bonding (with describes a wide range of sexual behavior)that is common.
"I just think it makes sense"
It not that it doesn't make sense per say it that there is an unstated and analyzed assumption imbedded in that statement. It makes the sense in the environments we tend to study. Evolution is about adaption to the environment which mating strategy makes the most sense for humans is not fixed and depends on the environment. For example sex ratio, unbalance the sex ratio and pair-bonding will make less and less sense as a mating strategy compared to polyandrous or polygynous strategies depending on which sex got hit.
This question is little like asking is it natural for humans to be blondes or brunettes. Nature likes variety and adaptability, humans have the natural capacity to adapt to many different mating strategies depending on environmental pressures; some environmental conditions are more commonly seen then others thus leading to certain mating strategies becoming more common then others but we as a spices aren't tied to a single mating strategy.
TL;DR: The "natural" mating strategy for human is "what ever works"; what ever works depends on the environment and other factors; however pair bonding approaches are admittedly popular.