bilby
Fair dinkum thinkum
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I do find it hard to reconcile the possibility of it being mostly cultural with the fact that for billions of years living things have been instinctually propagating themselves with no need for culture, and not only that, but in many cases deliberately caring for and raising their offspring.
Just throwing out ideas, but I do think it's possible that the mental acuity of people makes it possible, but not certain, for us to rise above the need to have kids. So subsets of our population (like those at Talk Freethought) have the ability to override the instinctual drive to pro-create, whereas other subsets feel an inherent need and desire to have kids. Almost like a neurological goldilocks zone that makes one more likely to like the idea of child-rearing. This theory would be supported by the fact that women group together on the bell curve in one area, and it's usually women pushing the species forward.
So with this in mind I might argue that having kids is maybe partly cultural, but also instinctual, just something that our genetic make-up usually causes us to do for whatever reason. And it trends this way because those who psychologically do not want kids will always fall out of the population.
Living things (with only the novel exception of post-contraception humans) require no distinction between 'instinctually propagating themselves' and 'propagating themselves due to choices influenced by culture' - from an evolutionary perspective, these amount to the same thing.
Only in the last tiny blink of an eye - at most a few hundred years, and more realistically a few decades - has the question of culture arisen; and then only in humans. Evolutionary history is therefore irrelevant to the question, because culture coupled with the ability to make it a significant influence on actual reproductive rates is a new trait that has simply not had time to be strongly selected for or against.
I'm not sure I understand what you mean here.
I'd argue that culture isn't a relatively new thing, by a long shot. The difference between modern times and pre-modern times are primarily a) knowledge and b) reproductive technologies. Culture has been a big and highly variable part of propagation for all of recorded (human) history, and probably human pre-history too. However, for the species to propagate people must a) have SEXkidsand b) successfully raise their kids.
So my argument is basically that reproduction has a significant genetic component, because that's intrinsic to propagation. Consider someone that genetically cannot raise their kids to adulthood, they'll fall out of the population. Only those that want to and can propagate do so, and so only their genes are passed on. This means that irrespective of cultural changes, culture will always be oriented toward propagation, and so will genetics.
Long story short this throws us back to an inherent psychological orientation toward wanting to have SEXand raise kids, it's quite literally in our DNA. I want to understand the nature of that DNA.
What's changed in modern times is only our ability to control how many kids we have. So people who don't want them can have sex and not pro-create, and people who only want one or two can do that too.
FTFY
The desire to have sex leads to genetically similar offspring. The desire to nurture children leads to a robust new generation - but nurturing children doesn't necessarily imply nurturing carriers of your own genetic information, because parenthood is uncertain (for men), and because one thing that is certain (in the absence of massive inbreeding) is that children are at best only carrying about half of your genes.
Sex is the important thing; Culture is relatively unimportant, until and unless the technical means exist to elevate culture - by allowing people to choose whether sex leads to children or not.
To be genetically successful in the absence of reliable and effective contraception, requires only a strong sex drive, and sufficient interest in looking after children to ensure that they mostly don't die before adulthood. A culture in which children are barely tolerated is perfectly OK from an evolutionary perspective - there is (until the advent of contraception) simply no evolutionary pressure to do more than the bare minimum for one's children - particularly when half of the parents are unsure that they are really theirs, and even the half who are sure only contributed half of the genes per child.
Parenting as it is understood in the developed world today would be unrecognizable to anyone from a century or more ago; or to many people in the developing world today. Culture evolves FAR faster than genes, and genes simply don't have time to adapt to the cultural background before it is whisked away and replaced with something totally different.