If I awoke with my mind wiped of all memories, to sit and watch humanity on a million secret CCTV's, I think I would conclude that the human race had been either modified or created by aliens running a vast social experiment, with a single goal.
We start out, excited about life, wanting warmth and sustenance and our mothers to cuddle and sustain us as our mammalian biology dictates. We scream demanding sweet calories from our mothers carbohydrate rich milk. And we get it. And we grunt in satisfaction, guzzling the deliciousness as fast as we can.
We grow, mature, and are suddenly really really good-looking. Beautiful, infact. Like the best looking we'll ever be in our lives, though we don't realize that yet.....
And raging full of hormones. And we are suddenly very attracted to the opposite sex, and want to do this thing that gives us a huge hormonal high. A literal drug trip in our brains. But free. And not bad for us.
And when we engage in this activity with someone, our brain dopes us up on oxytocin, which we have receptors for, which makes us 'bond' to that specific person. [monogamous voles have these oxytocin receptors. When they disabled them in their brains, the voles then behaved polyamorously like other species. Humans have these oxytocin receptors]
A person we have picked out for a various handful of perhaps subconscious but logical reasons that makes them stand out to us. Beauty or wit or making those hilarious jokes or geeking out about our favorite books together. Some personal infatuation algorithm we have that tries to calculate how to maximize our future happiness.
And then, the sexual-desire hormone, testosterone, which is super abundant in males, spikes precipitously in females...once a month...right on that little window of fertility. So when she suddenly when its the hardest to resist.....now....
BAM.
Now there is a baby.
And the baby comes out screaming for sustenance, and a womans breasts suddenly fill up PAINFULLY like they're going to burst, and the little desperate creature is the best at relieving this. And while she is doing this, then that oxytocin is released in her brain, as she holds this little mammal to her....the bonding chemical kicks in again.
And then, as the sleep deprivation subside, her hormones resume....and then even if she is trying to avoid this whole thing happening again (labor transition pain is after all not easily forgotten) well, the the testosterone spikes again at a critical moment, and her man is suddenly irresistible....
Source: https://xkcd.com/674/
And then there are more little people. And more. And more. And they are so darn cute, as we have been mentally programmed to find our offspring.
And they grow and grow.
And then....they turn into obnoxious teenagers who point out all our problems and our hypocrisy, with a nice dash of ungrateful and cutting insight into our psyches.
But at this point, we've sunk way too many sleepless nights and free housing and emotional energy into these obnoxious little punks, so we still want them to come home for holidays and blow out candles together.
And all the while our beauty fades and fades away....we sadly see some of those things that attracted us when we were young, to that person we have oxytocin-bonded too, fade away. It fades away in both of us.
And our health, our strength, our taste, our vigor, our ability to climb mountains and taste maple-syrup, all the things that made life fun, fade away....
And finally, even our mental capabilities fade away....
And we are a shell of our former gifts, old, wrinkled, bent, fat, and finally, stupid.....
And all that's left, is the soul.
The choice to love, that all began, for very calculated and logical reasons, to maximize our happiness..... in the end, remains when all the reasons are taken away. Illogical, but there.
....and we realize....as everything fades away......
.........that we have finally learned to love.
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This song says it better than I ever could