Sex at Dawn

Darwin’s sense of the coy female wasn’t based only on his Victorian assumptions. In addition to natural selection, he proposed a second mechanism for evolutionary change: sexual selection. The central premise of sexual selection is that in most mammals, the female has a much higher investment in offspring than does the male. She’s stuck with gestation, lactation, and extended nurturing of the young. Because of this inequality in unavoidable sacrifice, Darwin reasoned, she is the more hesitant participant, needing to be convinced it’s a good idea—while the male, with his slam-bam-thank-you-ma’am approach to reproduction, is eager to do the convincing. Evolutionary psychology is founded on the belief that male and female approaches to mating have intrinsically conflicted agendas.

The selection ofthe winning bachelor typically involves male competition: rams slamming their heads together, peacocks dragging around colorful, predator-attracting tails, men bearing expensive gifts and vowing eternal love over candlelight. Darwin saw sexual selection as a struggle between males for sexual access to passive, fertile females who would submit to the victor. Given the competitive context his theories assume, he believed “promiscuous intercourse in a state of nature [to be] extremely improbable.” But at least one of Darwin’s contemporaries disagreed.

Lewis Henry Morgan

To white people, he was known as Lewis Henry Morgan (1818-1881), a railroad lawyer with a fascination for scholarship and the ways in which societies organize themselves. The Seneca tribe of the Iroquois Nation adopted Morgan as an adult, giving him the name Tayadaowuhkuh, which means “bridging the gap.” At his home near Rochester, New York, Morgan spent his evenings studying and writing, trying to bring scientific rigor to understanding the intimate lives of people made distant by time or space. The only American scholar to have been cited by each of the other three intellectual giants of his century, Darwin, Freud, and Marx, many consider Morgan the most influential social scientist of his era and the father of American anthropology. Ironically, it may be Marx and Engels’s admiration that explains why Morgan’s work isn’t better known today. Though he was no Marxist, Morgan doubted important Darwinian assumptions concerning the centrality of sexual competition in the human past. This stance was enough to offend some of Darwin’s defenders—though not Darwin himself, who respected and admired Morgan. In fact, Morgan and his wife spent an evening with the Darwins during a trip to England. Years later, two of Darwin’s sons stayed with the Morgans at their home in upstate New York.

Morgan was especially interested in the evolution of family structure and overall social organization. Contradicting Darwinian theory, he hypothesized a far more promiscuous sexuality as having been typical of prehistoric times. “The husbands lived in polygyny [i.e., more than one wife], and the

wives in polyandry [i.e., more than one husband], which are seen to be as ancient as human society. Such a family was neither unnatural nor remarkable,” he wrote. “It would be difficult to show any other possible beginning ofthe family in the primitive period.” A few pages later Morgan concludes that “there seems to be no escape” from the conclusion that a “state of promiscuous intercourse” was typical of prehistoric times, “although questioned by so eminent a writer as Mr. Darwin.”²⁵

Morgan’s argument that prehistoric societies practiced group marriage (also known as the primal horde or omnigamy—the latter term apparently coined by French author Charles Fourier) so influenced Darwin’s thinking that he admitted, “It seems certain that the habit of marriage has been gradually developed, and that almost promiscuous intercourse was once extremely common throughout the world.” With his characteristic courteous humility, Darwin agreed that there were “present day tribes” where “all the men and women in the tribe are husbands and wives to each other.” In deference to Morgan’s scholarship, Darwin continued, “Those who have most closely studied the subject, and whose judgment is worth much more than mine, believe that communal marriage was the original and universal form throughout the world.. The indirect evidence in favour of this belief is extremely strong..”²⁶

Indeed it is. And the evidence—both direct and indirect—has grown much stronger than Darwin, or even Morgan, could have imagined.