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Evolution of monogamy Monogamy occurs when one male mates with one female exclusively. A monogamous mating system is one in which individuals form long-lasting pairs and cooperate in raising offspring. These pairs may last for a lifetime, such as in pigeons ,  or it may occasionally change from one mating season to another, such as in emperor penguins. Zoologists and biologists now have evidence that monogamous pairs of animals are not always sexually exclusive.
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Youngsters participating in Wet T-shirt contest during Spring break , USA The term "sexual revolution" has been used since at least the late s. Indicators of non-traditional sexual behavior e. Lawrence , Sigmund Freud , and the Surrealist movement. Another likely cause was a vast improvement in obstetrics , greatly reducing the number of women who died due to childbearing, thus increasing the life expectancy of women. A third, more indirect cause was the large number of children born in the s and early s all over the western world—the ' Baby Boom Generation '--many of whom would grow up in relatively prosperous and safe conditions, within a middle class on the rise and with better access to education and entertainment than ever before. By their demographic weight and their social and educational background they came to trigger a shift in society towards more permissive and informalized attitudes.
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