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Jack comments on Summer vs Winter Strategies - Less Wrong
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Change this to "success of Europe" or something like that.
Also, this hypothesis isn't doing much for me given all the other cold, rugged places in the world.
Why?
Differential investment in offspring due to biology. Women risk 9 months of labour when having sex and then have to wean the baby. Men aren't forced to be around during this and can ditch and rely on the woman + family to raise the kid. This is called parental investment.
This whole theory is predicated on pregnancy happening as the result of this mating behaviour. In other words it only works when no reliable form of contraception is available. In modern society it has broken down. also it does not explain how in "winter" wartime conditions there seems to be more promiscuity and babies born to unstable parental relationships.