Sexual Dimorphism

A number of well-known anthropologists have argued that various attitudes and customs often found in human societies are instinctual rather than culturally learned and come from our primate heritages. They include hierarchies of ranking among men, male political power over women, and the greater tendency of men to form friendships with one another, as opposed to women’s tendencies to cling to a man.

Some of us might be disagree with those conclusions and think that they stem from the male chauvinism of our own society. A ‘scientific” argument which states that all such feature of female inferiority are instinctive is obviously a powerful weapon in maintaining the traditional family with male dominance. But in fact, these feature are not universal among nonhuman primates, including some of those most closely related to humans. Chimpanzees have a low degree of male dominance and male hierarchy and are sexually virtually indiscriminate. Gibbons have a kind of fidelity for both sexes and almost no male dominance or hierarchy. Howler monkeys are sexually indiscriminate and lack male hierarchies or dominance.

The fact is that among nonhuman primates male dominance and male hierarchies seem to be adaptations to particular environments, some of which did become genetically established through natural selection. Among humans, however, these features are present in variable degrees and are almost certainly learned, not inherited at all. Among nonhuman primates there are fairly general differences between those that live mainly in trees and those that live largely on the ground. The tree dwellers (for example gibbons, orang-utans, South American howler, and woolly monkeys) tend to have to defend themselves less against predators than do the ground dwellers (such as baboons, macaques, or gorillas). Where defense is important, males are much larger and stronger than females, exert dominance over females, and are strictly hierarchized and organized in relation to one another. Where defense is less important there is much less sexual dimorphism (difference size between male and female), less or no male dominance, a less pronounced male hierarchy, and greater sexual indiscriminacy.

Comparatively speaking, humans have a rather small degree of sexual dimorphism, similar to chimpanzees. Chimpanzees live much in trees but also partly in the ground, in forest or semiforest habitats. They build individual nest to sleep in, sometimes on the ground but usually in trees. They flee into trees from danger. Chimpanzees go mainly on all fours, but sometimes on two feet, and can use and make simple tools. Males are dominant, but not very dominant, over females. The rank hierarchy among males is unstable, and males often move between groups, which vary in size from two to fifty individuals. Food is vegetarian, supplemented with worms, grubs, or occasional small animals. A mother and her young form the only stable unit. Sexual relations are largely indiscriminate, but nearby males defend young animals from danger. The chances are that our prehuman ancestors had a similar social life.

Is it wrong to conclude that we came from a state of “original promiscuity” before we were fully human?.

Sexual Bonds Among Primates

Some nonhuman primates do have enduring sexual bonds and restrictions, superficially similar to those in some human societies. Among gibbons a single male and female live together with their young. The male drives off other males and the female, other females. When a juvenile reaches puberty it is thought to leave or be expelled by the parent of the same sex, and he eventually finds a mate elsewhere. Similar de facto, rudimentary "incest prohibitions" may have been passed on to humans from their prehuman ancestors and later codified and elaborated through language, moral custom, and law. Whether this is so may become clearer when we know more about the mating patterns of the other great apes, especially of our closest relatives, the chimpanzees. Present evidence suggests that male chimpanzees do not mate with their mothers.

Orang-utans live in small, tree-dwelling groups like gibbons, but their forms are less regular. One or two mothers may wander alone with their young, mating at intervals with a male; or a male-female pair or several juvenile males may travel together.

Among mountain gorillas of Uganda, South Indian langurs, and hamadryas baboons of Ethiopia, a single, fully mature male mates with several females, especially in their oestrus periods. If younger adult males are present, the females may have occasional relations with them if the leader is tired or not looking.

Among East and South African baboons, rhesus macaques, and South American woolly monkeys, the troop is bigger, numbering up to two hundred. It contains a number of adult males and a much larger number of females. The males are strictly ranked in terms of dominance based on both physical strength and intelligence. The more dominant males copulate intensively with the females during the latter’s oestrus periods. Toward the end of of oestrus a female may briefly attach herself to a single dominat male. At other times she may have relations with any male of higher or lower rank provided that those of higher rank permit it.

Among some baboons and macaques the young males travel on the outskirts of the group and have little access to females. Some macaques expel from the troop a proportion of the young males, who then form "bachelor troops." Bachelors may later form new troops with young females. Other primates are more thoroughly promiscuous, or rather indiscriminate, in mating. Chimpanzees and also South American howler monkeys live in loosely structured groups, again (as in most monkey and ape societies) with a preponderance of females. The mother-child unit is the only stable group. The sexes copulate almost at random and most intensively and indiscriminately during oestrus.

Primate Societies

Within the primate order, humans are most closely related to the anthropoid apes (the African chimpanzee and gorilla and the Southeast Asian orang-utan and gibbon), and of these, to the chimpanzee and the gorilla. More distantly related are the Old, and then the New, World Monkeys, and finally, the lemurs, tarsiers, and tree shrews.
 
All primates share characteristics without which the family could not have developed. The young are born relatively helpless. They suckle for several months or years and need prolonged care afterwards. Childhood is longer, the closer the species is to humans. Most monkeys reach puberty at about four to five and mature socially between about five and ten. Chimpanzees, by contrast, suckle for up three years. Females reach puberty at seven to ten; males enter mature social and sexual relations as late as thirteen.
 
The long childhood and maternal care produce close relations between children of the same mother who play together and help tend their juniors until they grow up. Monkeys and apes, like humans, mate in all months of the year instead of in a rutting season. Unlike humans, however, female apes experience unusually strong sexual desire for a few days shortly before and during ovulation (the oestrus period) and have intensive sexual relations at that time. The male are attracted to the females by their scent or by brightly colored swellings in the sexual region. Oestrus mating appears to be especially pronounced in primate species more remote from humans. The apes and some monkeys carry on less intensive month-round sexuality in addition to oestrus mating, approaching human patterns more closely. In humans, sexual desires and relations are regulated less by hormonal changes and more by mental images, emotions, cultural rules, and individual preferences.
 
Year-round (if not always month-round) sexuality means that males and females socialize more continuously among primates than among most other mammals. All primates form bands or troops composed of both sexes plus children. The numbers and proportions of the sexes vary, and in some species an individual, a mother with her young, or a subsidiary troop of male juveniles may travel temporarily alone. But in general, males and females socialize continually through mutual grooming (combing the hair and removing parasites with hands or teeth) and playing as well as through frequent sex relations. Keeping close to the females, primate males play with their children and tend to protect both females and young from predators. A “division of labor” based on gender is thus already found in primate society between a female role of prolonged child care and a male role of defense. Males may also carry or take care of children briefly, and non nursing females may fight. But a kind of generalized “fatherliness” appears in the protective role of adult males towards young, even in species where the sexes do not form long-term individual attachments.

Feminist Golden Age

It is true that in some matrilineal societies, such as the Hopi of Arizona or the Ashanti of Ghana, men exert little authority over their wives. In some, such as the Nayars of South India or the Minangkabau of Sumatra, men may even live separately from their wives and children, that is, in different families. In such societies, however, the fact that women and children fall under greater or lesser authority from the women’s kinsmen – their eldest brothers, mother’s brothers, or even their grown-up sons.
 
In matrilineal societies, where property, rank, office, and group membership are inherited through the female line, it is true that women tend to have greater independence than in patrilineal societies. This is especially so in the matrilineal tribal societies where residence is matrilocal – that is, men come to live in the homes or villages of their wives. Even so, in all matrilineal societies for which adequate descriptions are available, the ultimate headship of households, lineages, and local groups is usually with men.
 
There is in fact no true “matriarchal,” as distinct from “matrilineal,” society in existence or known from literature, and the chances are there never has been. This does not mean that women and men have never had relations that were dignified and creative for both sexes, appropriate to the knowledge, skills, and technology of their names. Nor does it mean that the sexes can not be equal in the future or that the sexual division of labor can not be abolished. Some of us believe that it can be and must be. But it is not necessary to believe myths of a feminist Golden Age in order to plan for parity in the future.

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Why only now I realize that I was not alone in this world, nor the last creature on earth? It contained two meanings such as double-edged knife. Let's hope this becomes the ultimate of so exhausting journey.

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