Even if you remove the religious aspect from consideration, it ignores the primary benefit for monogamy: to provide a more stable environment for procreation and rearing of young.
Otherwise why not just do what Leo does: catch at 18, release at 25?
Well the religious aspect is what turned it from "serial monogamy" into "committed." From simply being together until it no longer benefits, into a sealed deal until death.
Because if it was only for raising young, there would be little point at remaining together past 55~ when nearly all possible children are fully grown.
Even if you remove the religious aspect from consideration, it ignores the primary benefit for monogamy: to provide a more stable environment for procreation and rearing of young.
Otherwise why not just do what Leo does: catch at 18, release at 25?
Well the religious aspect is what turned it from "serial monogamy" into "committed." From simply being together until it no longer benefits, into a sealed deal until death.
Because if it was only for raising young, there would be little point at remaining together past 55~ when nearly all possible children are fully grown.