[svnt]

You don’t need famine; a wealthy societal elder is better positioned to marry his or her children and grandchildren into situations where they will have more children and their children will be better provided for. An elder male could continue reproducing by finding additional mates. There is good evidence that male genetic diversity is much lower than we would expect if most of our ancestors were monogamous.

Bugs might reproduce primarily constrained by their LDL uptake but humans are far more complex.