I have to disagree somewhat with the previous reviewer. Unwin is a very methodical anthropologist, and so he carefully distinguished between the facts that he uncovers and the explanation he offers of those facts. The primary thesis of this book is that the development of a society correlates with its regulation of female prenuptial chastity. But Unwin was a Freudian liberal, so he felt compelled to come up with as unsexist an explanation as possible, and this is where his idea comes from that prenuptial chastity causes sexual repression which in turn causes energy to be redirected into developing culture. Of course this is complete nonsense, but I forgive Unwin both because living in the 1930s, he couldn’t have a deep understanding what conditions are really like when a society reaches an advanced state of feminist decay, and because I am extremely grateful to Unwin for honestly recording facts that were at odds with his own beliefs. But even Unwin should have realized from historical evidence that his explanation was wrong. Ancient Athens was probably the most productive civilization in history, and never did a society have less sexual repression for men than Athens did, where the government subsidized prostitution so that men were never in need for sex, and where women could not interfere with the productive energy of men.
Of course I rate this book 5 stars. It is the most important book written since The Origin of Species. But since the facts it contains are not politically correct, it is doomed to obscurity. The lack of availability of this book, because it is out of print, is just part of the cultural decay of our society caused the lack of regulation of female sexuality that Unwin so well chronicled.
From the United States

Reviewed in the United States on January 12, 2019
Excellent contents. I’ve read through much of the book in PDF form, and wanted a paper copy. It seems most of the content is faithfully represented. One star off for whoever printed this run of books for the eye burning typo on the back cover.
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Reviewed in the United States on February 17, 2021
Pretty dry, fairly dense, but the ideas espoused are both groundbreaking and taboo. Should be read by anyone wanting to develop civilizational public poicy
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Reviewed in the United States on June 19, 2008
I have to disagree somewhat with the previous reviewer. Unwin is a very methodical anthropologist, and so he carefully distinguished between the facts that he uncovers and the explanation he offers of those facts. The primary thesis of this book is that the development of a society correlates with its regulation of female prenuptial chastity. But Unwin was a Freudian liberal, so he felt compelled to come up with as unsexist an explanation as possible, and this is where his idea comes from that prenuptial chastity causes sexual repression which in turn causes energy to be redirected into developing culture. Of course this is complete nonsense, but I forgive Unwin both because living in the 1930s, he couldn’t have a deep understanding what conditions are really like when a society reaches an advanced state of feminist decay, and because I am extremely grateful to Unwin for honestly recording facts that were at odds with his own beliefs. But even Unwin should have realized from historical evidence that his explanation was wrong. Ancient Athens was probably the most productive civilization in history, and never did a society have less sexual repression for men than Athens did, where the government subsidized prostitution so that men were never in need for sex, and where women could not interfere with the productive energy of men.
Of course I rate this book 5 stars. It is the most important book written since The Origin of Species. But since the facts it contains are not politically correct, it is doomed to obscurity. The lack of availability of this book, because it is out of print, is just part of the cultural decay of our society caused the lack of regulation of female sexuality that Unwin so well chronicled.
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Reviewed in the United States on April 19, 2015
This isn’t actually a review of the book, as I haven’t completely read it yet.
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Reviewed in the United States on March 30, 2008
That is the basic thesis of this unjustly forgotten book. According to Professor Unwin, who was influenced by Freud, it is the “limitation of sexual opportunity” which creates the “mental energy” necessary to build a civilization.
He backs this up with exhaustive examples of the historical cycle he proposes. The cycle goes as follows: in a primitive society, people take their pleasure at whim, without commitment or limits. Then the practice of monogamous marriage, including premarital chastity, is instituted. (How he believes this first arises would take far too long to summarize here; read the book!) The sexual repression required for this chastity and fidelity increases the “mental energy” and the inner strength of those who practice it, enabling them to embark on long-term projects such as monumental architecture, agriculture, and conquest. In this early stage, men have enormous power over their wives and children, even when the children have grown up.
The “sexual opportunity” of women is always, of necessity, more limited than that of men in a civilized society, and this has a powerful effect, according to Unwin; they convey this repression and its benefits to their children. Indeed, he blames the decline of feudalism on its habit of putting its “best” women into convents to live as nuns – it is true that for a woman with intellectual aspirations, a convent was her only real option – instead of having them bear children to whom they could convey their “mental energy”.
Unwin also criticizes polygamous societies; the easy “sexual opportunity” it affords men limits the “mental energy”. He says, “That is why, I submit, the Moors in Spain achieved such a high culture. Their fathers were born into a polygamous tradition; but their mothers were the daughters of Christians and Jews, and had spent their early years in an absolutely monogamous environment. The sons of these women laid the foundations of rationalistic culture; but soon the supply of Christian and Jewish women was insufficient, so the incipient rationalism failed to mature greatly.”
It always begins with the ruling class, the aristocracy, being the most chaste and monogamous. As they grow decadent after a few generations, the “middle class” (not necessarily in our modern understanding of it) is just getting the hang of it, having aped it from their betters, and they acquire more power in the society.
In time, however, the strict monogamy loosens. Unwin speculates that the extreme power the builders of civilizations have over their wives and children is unbearable to most, and the decrease of this power is inevitable. Unwin’s attention is more on the monogamy than on the legal position of women, but the two seem to march hand in hand. “A female emancipating movement is a cultural phenomenon of unfailing regularity; it appears to be the necessary outcome of absolute monogamy. The subsequent loss of social energy after the emancipation of women, which is sometimes emphasized, has been due not to the emancipation but to the extension of sexual opportunity which has always accompanied it. In human records there is no instance of female emancipation which has not been accompanied by an extension of sexual opportunity.”
Indeed, as sexual opportunity becomes easier – which always takes place in concert with female emancipation – the society’s mental energy weakens, it cannot continue to invent things or maintain what it has, and in a few generations it is easily conquered by a robust monogamous patriarchy, which is fairly bursting with the mental energy of repressed sexuality.
Professor Unwin, by the way, was not in any way a male chauvinist. He concluded his book with a hopeful wish that we may find some way to have sexual repression and the equality of the sexes at the same time, and clearly believed that women are not inherently unfit for power and independence.
That is one of the two criticisms I would make of this excellent work. But one can hardly blame Professor Unwin, who was writing in 1934, long before scientific study had verified that all of the traditional stereotypes about women were based in biological fact. Indeed, thanks to feminist domination of mass media, few people today are aware of this.
The other criticism is that Unwin focuses all of his attention on the “mental energy” caused by sexual repression. I suspect he is right about it, but there is another vital factor in the building of a civilization, and that is paternity. Men build things – houses, palaces, empires, codes of ethics – so that they can pass them on to their own children, and thus achieve one kind of immortality. Men who know they cannot train and endow their children are disinclined to produce. This, even more than the lack of opportunity for personal enrichment, is why communism and socialism are such abysmal failures, and why inheritance tax is such a dangerous threat to civilization itself. It would be good to read an intertwining of this theory and Unwin’s.
This book has long been out of print and copies are rare and expensive, but until this situation is remedied, it can be obtained through inter-library loan. I highly recommend it for its exhaustive documentation.
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Reviewed in the United States on August 18, 2013
From my knowledge of this book and my own observation of nations and from biblical history I would say that “Sex and Culture” hits the nail right on the head, no punning intended. Every society that has deviated from the sexual norms has eventually destroyed itself. Either nations have redeemed themselves by coming to grips with perversion and changing its moral attitudes for the better or they have continued therein and have destroyed themselves. Take for example the ancient Canaanite culture before the entry of the Hebrews. In the Bible we read of how perverted they had become and how God was now ready to destroy them. Also, this account of their perversity has been substantiated by the archaeological finds in Canaan. We are told of the sordid immoral behavious of these nations as found in the ancient documents. We see the same thing happening in Europe and the world. Here we have same sex marriage which ultimately destroys society physically, not to mention the killer diseases and others accrued thereby. Then there is the additional violence generated by these people. When we extrapolate this world wide we are in for a rude awakening. First, see how these people and their promoters, the governments, seek to destroy, cudgel, intimidate, blackmail, and vilify all those who disagree with their abnormal practice. Secondly, God has strictly warned of impending destruction of these nations and peoples that practice such destructive acts. Thirdly, notice how these promoters seek to demolish Christianity and pervert its teaching in order to sanitize these unhealthy practices. fourthly, we are now experiencing the laws promoting transgender rights-using the washrooms of boys and girls, men and women. Men in women’s washrooms, women in men’s washrooms in schools, and soon in public. What a recipe for rape and voyeurism and more. Our selected leaders are perverting our turf right in our eyes, and using the legal arm to intimidate us; and also soliciting the schools to cement these perversions. Fifthly, with the brainwashing of our children in the public schools, and the banning of the private schools from dissenting, we have set the stage for the perfect collapse of society. And that is why God will intervene. Is not Unwin absolutely right in his assessment of the demise of nations as regards sexual morality? To deny this would be to go against the grain of nature’s normality. And remember, the abnormal us sooner or later terminated!
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From other countries

Chris X
5.0 out of 5 stars
Phenomenal
Reviewed in the United Kingdom on May 30, 2019
An important and very interesting study that maybe as a society/civilisation we can learn
from..perfect if you’re anti-PC.
4 people found this helpful

Cornelius
5.0 out of 5 stars
Brilliant and Shocking Exposition of Sexual Regulations and Cultural Advance
Reviewed in Canada on November 26, 2019
Unger surveys eighty so-called ‘primitive’ civilizations, as well as six advanced civilizations, and finds a stunning correlation between the extent of a society’s pre-marital and post-marital sexual regulations, and its civilizational advance (conquest, exploration, abstract thought, industry, commerce, etc.). In general, the more restrained a society is when it comes to sex, the more repressed sexual energy is created; that repressed energy is then transformed into, and given full expression in, productive, outward endeavours.
As an anthropologist, Unger is surprisingly careful; since this book was published in 1934, I expected a stereotypical Englishman’s exaltation of the white man’s superior intellect. Unger does not fall for such preposterousness; he even admits that there is no reason to believe that coloured men have inferior intellects or abilities. In fact, he argues against the racialism that prevailed in his day.
Although Unger’s correlation is interesting, and his causation convincing, I am not convinced by his proposed mechanism: Freudian sexual sublimation. In fact, there are more direct mechanisms that would explain why repressed sexuality translates into powerful outward displays of productive and expansive energy:
1. When sex is more difficult to procure, people engage in more productive activities. This is a simple opportunity cost formula.
2. Men won’t invest resources in children that aren’t theirs. Sexual restraint ensures that women are less likely to cheat and conceive children with other men.
3. Hypergamy is dominant: without sexual restraint, men and women expend energy in attaining unachievable sexual partners.
Aside from these shortcomings, Unger’s book is worth reading if you are interested in why sexual restraints come about, and how they relate to civilizational advance.

David Mercer
5.0 out of 5 stars
Fascinating social anthropology
Reviewed in Canada on July 11, 2021
The author was nearly lost to obscurity, but has been remembered and recovered in a most timely way. His epic study of world cultures revealed the key and core role that sexual mores play in determining cultural vitality and even the endurance of a society. History does not always repeat itself, yet we would be blind and dull not to heed the evidence of the past. Worth reading and then asking serious questions about the route Western Society has taken, and whether it can truly continue as such.

Alexei
5.0 out of 5 stars
I will read this book many times throughout my life
Reviewed in Canada on March 13, 2020
Fantastic book.
The first chapter explains how he is going to tackle the issue.
The second and third chapter gathers all the evidence from mostly uncivilized societies.
It’s a great book that will change the way you view our society and even individuals.