Marriage and Morals
Marriage and Morals is a 1929 book by philosopher Bertrand Russell, in which the author questions the Victorian notions of morality regarding sex and marriage. Russell argues that the laws and ideas about sex of his time were a potpourri from various sources and were no longer valid. The subjects range from criticisms of social norms, theories about their origins and tendencies, evolutionary psychology, and instinctual attachment to children (or lack thereof), among others. Notably, the book found marital rape to be common, stating: "Marriage is for woman the commonest mode of livelihood, and the total amount of undesired sex endured by women is probably greater in marriage than in prostitution.". Russell also argues for increased availability of birth control, the decriminalization of homosexuality, improved sex education, easier access to divorce, and greater freedom of women to pursue their own interests and careers.
Marriage and Morals is a 1929 book by philosopher Bertrand Russell, in which the author questions the Victorian notions of morality regarding sex and marriage.
Russell argues that the laws and ideas about sex of his time were a potpourri from various sources and were no longer valid. The subjects range from criticisms of social norms, theories about their origins and tendencies, evolutionary psychology, and instinctual attachment to children (or lack thereof), among others. Notably, the book found marital rape to be common, stating: "Marriage is for woman the commonest mode of livelihood, and the total amount of undesired sex endured by women is probably greater in marriage than in prostitution.".  Russell also argues for increased availability of birth control, the decriminalization of homosexuality, improved sex education, easier access to divorce, and greater freedom of women to pursue their own interests and careers.

Cultural response
Marriage and Morals prompted vigorous protests against and denunciations of Russell during his visit to the United States shortly after the book's publication. A decade later, the book, along with his protest against US involvement in World War II and his generally controversial position in public discourse, cost him his professorial appointment at the City College of New York, owing to a court judgment from a Catholic judge that his opinions made him "morally unfit" to teach. A public outcry, initiated by the mother of a student who was ineligible for his course in mathematical logic, preceded the ruling. John Dewey and several other intellectuals protested against his treatment. Albert Einstein's often-quoted aphorism that "Great spirits have always encountered violent opposition from mediocre minds" is from his open letter in support of Russell.

Eugenics
In chapter eighteen, Russell discusses eugenics, expressing humanitarian reservations about many aspects and cautious approval for others. On the topic of "negative eugenics" (selecting against undesirable qualities), he concludes that most such qualities are too subjectively defined, but that sterilization on the basis of "mental deficiency" is justifiable. He explores the idea of "positive eugenics" (selecting for desirable qualities), concluding that such a program would be fraught with moral issues but could produce a very militarily capable nation.On the subject of race, he wrote "It seems on the whole fair to regard negroes as on the average inferior to white men". In later editions this was changed to "There is no sound reason to regard negroes as on the average inferior to white men". Russell would later write "I never held Negroes to be inherently inferior. The statement in Marriage and Morals refers to environment conditioning". Later in the same chapter Russell wrote   
that most racial eugenics is "an excuse for chauvinism."

Nobel Prize
According to Russell, he was awarded the Nobel Prize in Literature for Marriage and Morals.
When I was called to Stockholm, at the end of 1950, to receive the Nobel Prize – somewhat to my surprise, for literature, for my book Marriage and Morals – I was apprehensive, since I remembered that, exactly 300 years earlier, Descartes had been called to Scandinavia by Queen Christina in the winter time and had died of the cold.
The Nobel Foundation, on the other hand, wrote that the prize recognized "his varied and significant writings in which he champions humanitarian ideals and freedom of thought"; not any particular work.

References
External links
 Quotations related to Marriage and Morals at Wikiquote
Full text at archive.org