One of our big problems as a society is that we tend to reject what are biologically evolved social systems, because we do not understand them, and think they are frivolous. And these can be pretty harsh. Here are some:
1) Not everyone is designed to reproduce. For whatever reasons, only a percentage of people are supposed to breed, and are equipped to be good parents. And biology has come up with a lot of ways for non-breeders to not interfere with breeders. This includes homosexuality, prostitution and post-menopausal sexuality. However, our society is so oriented to breeding that it has no “social place” for non-breeders.
2) Marriage has a *biological* purpose. Marriage is a far better system than just typical mammalian reproduction, as it benefits the husband, the wife, and especially, their children, giving up sexual liberty in exchange for monogamy. But marriage only works when it is culturally *enforced*, to prevent outsiders from interfering with it.
3) The underlying biological purpose of marriage can be undermined through the use of the dowry and arranged marriages. This led many to assume that marriage was frivolous, so should be dispensed with, or at least not socially enforced. They were joined in this by non-breeders who wanted to sexually function at a more animalistic level, not responsibly reproduce, just have sex.
4) The advantages to children raised by a male-female married couple are enormous, as they are raised with an mode of success and improvement. Children raised by a single parent are raised in a “default” mode of survival, which is why they are 60% more likely to criminally offend. They lack adequate family support, so their lives are dominated by needs, not wants.
5) If somehow we can scientifically determine which people are oriented to breeding, and which are not, society can set up cultural means to protect breeding couples, and encourage non-breeders to develop a career path. This does not mean coercion, but recognition that breeding couples need societal support and protection for their marriages.
Ah, you're one of those! Five-year plan? I smell the ghost Lewis out of That Hideous Strength? with that swelling brain in a vat seeping out while under examination. If ever the soul pops up after amputation, give it another regulated dosage.