I think one salient point is the fact that we live in a world where the number of children you have is pretty much directly equivalent to your evolutionary fitness. In the past your evolutionary fitness was bottlenecked by whether you survive childhood, whether your children survive childhood, whether you are able to feed your children, etc—all in a malthusian environment.
This means that the selection pressure for genes that increase your fertility is extremely strong. Much stronger than any selection pressure on any single trait that has been selected for in the past, say light skin or lactase persistence in Europeans.
I think one salient point is the fact that we live in a world where the number of children you have is pretty much directly equivalent to your evolutionary fitness. In the past your evolutionary fitness was bottlenecked by whether you survive childhood, whether your children survive childhood, whether you are able to feed your children, etc—all in a malthusian environment.
This means that the selection pressure for genes that increase your fertility is extremely strong. Much stronger than any selection pressure on any single trait that has been selected for in the past, say light skin or lactase persistence in Europeans.