The Three-Generation Bill Comes Due
J.D. Unwin predicted that loosening sexual restraint would cost a civilization its energy within three generations. We are inside the window.
In 1960, a technology severed an act from its biological function for the first time at scale. The cultural history has been told but the biological event has not. In First Principles, I explain how every act in our nature stacks two functions — what we feel and what nature selected for — and what happens when technology cuts the stack. In More Than the Headline, I walk through the collapse in fertility, marriage, and religious affiliation, Mayr's proximate-ultimate distinction, and de Waal on bonobo-style sexuality. In From the Archives, I bring in three full passages from J.D. Unwin's Sex and Culture (1934) on how no civilization has displayed energy without absolute monogamy, how female emancipation movements appear with unfailing regularity at the end of cultural cycles, and how productive social energy depends on a generation inheriting restraint.
“The act of generation is the most distinct and strongest affirmation of the will to life.”
— Arthur Schopenhauer, The World as Will and Representation
Mayr's Proximate-Ultimate Distinction
Nature stacks two purposes on every act in our biology: the reward we feel and the function it serves.
When technology severs the two, the act remains and the function dies.
The energy that should have gone into building the future dissipates into sensation.
The Pill Severed the Stack
In the 1960s, the birth control pill achieved mass adoption. The cultural history of sexual liberation has been told a hundred times. Typically as freedom, progress, and overdue. The biological event underneath it has not been told at all.
For the first time at scale, a population could sever sex from its evolutionary function. The act survived but the function did not. Every Western nation has stayed below replacement for fifty years.
This pattern was predicted. In 1934, Oxford anthropologist J.D. Unwin published Sex and Culture, a study of 86 different societies testing whether sexual restraint correlated with civilizational achievement. He expected to disprove the connection. Instead, he found it without exception. Cultures practicing absolute monogamy produced expansive and productive energy, such as art, science, conquest, and commerce. Loosening sexual restraint always cost that cultural energy within three generations. He predicted any society making the shift would abandon rationalism, deism, and monogamy itself.
Three generations from 1960 lands in our near future. The predictions are becoming visible. Religious affiliation has collapsed; the share of Americans with no religion has tripled in a generation. Marriage has followed; the median age at first marriage is the highest on record, and a record share will never marry. Rationalism is giving way to egoism, identity, and emotion. Three predictions, three confirmations.
Unwin observed the correlation. Although, he could not have accounted for contraception, which did not exist in his data. Mayr’s proximate-ultimate distinction names what the technology did. Every act in our nature stacks two functions: a proximate cause (pleasure and social status) and an ultimate cause (offspring). Sex carried both. Contraception severed the stack, leaving behaviour optimized for sensation and decoupled from the function it served. Frans de Waal observed that bonobos quite often use sex for social currency, female authority, and paternity confusion. Reproduction is rare. Post-pill humans exhibit the same behaviour.
Many will likely try to point to other factors: female education, urbanization, female labor force participation, GDP, and cost-of-living. Each correlates with falling fertility. Each also requires the severing. There is no career-first life structure, no late-life education, no mass female labor without technological control of reproduction. The confounders are downstream of the pill.
It would seem that women can consider themselves free from child rearing, but have no daughters to inherit that freedom. The institutions that pushed the trend and wrote it into policy now import replacement populations that do not share these values, rather than reverse what they did.
Sexual Restraint and Civilizational Energy
Unwin died in 1936 at 41, before he could fully develop what his findings meant for industrial modernity. The passages below are the anthropological observations of a researcher who treated cultural decline as a pattern to be measured more than a tragedy to be mourned.
