Not sure about the exact math here, but there is diminishing "returns" to the genes with every additional offspring. Going from "zero offspring" to "one offspri

Not sure about the exact math here, but there is diminishing "returns" to the genes with every additional offspring. Going from "zero offspring" to "one offspring" is the biggest jump genes can make. Two is 100% better than one. But three is only 50% better than two. Four is only 33% better than three.... etc So once you get to like 10 kids, you're really not getting much more evolutionary advantage for each additional kid. You don't have the same relentless pressure that privileges genes that are provide extreme longevity.