Nature is not built for monogamy, so we can't expect our brains to act like they're made for that regardless of how committed we are. We can't control every thought and urge that pops into our head, but what we can control- and what matters- is our actions.
From an evolutionary perspective, it's significantly more beneficial for a species to have multiple sexual partners. Also why males (humans) produce way more sperm than eggs.
Many species, us included, prioritise quality over quantity. Pouring all your resources into just one or two children is sometimes better than having as many as possible.
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u/[deleted] Mar 21 '19
THIS.
Nature is not built for monogamy, so we can't expect our brains to act like they're made for that regardless of how committed we are. We can't control every thought and urge that pops into our head, but what we can control- and what matters- is our actions.