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The following is a practice in Wiki markup, using the version of the One sex two sex theory article available on January 13, 2013, at 4:10p.m. EST.

The one-sex and two-sex theory are two models of human anatomy or fetal development discussed in Thomas Laqueur's book Making Sex: Body and Gender from the Greeks to Freud. He theorizes that a fundamental change in attitudes toward human sexual anatomy occurred in Europe in the 18th and 19th centuries. Prior to the eighteenth century, it was a common belief that women and men represented two different forms of one essential sex: that is, women were seen to possess the same fundamental reproductive structure as men, the only difference being that female genitalia was inside the body, not outside of it. Anatomists saw the vagina as an interior penis, the labia as foreskin, the uterus as scrotum, and the ovaries as testicles. However, around the 18th century, the dominant view became that of two sexes directly opposite to each other. There was an abundance of literature written in the 18th century supporting the two sex model. Jacques-Louis Moreau wrote that "not only are the sexes different, but they are different in every conceivable aspect of body and soul, in every physical and moral aspect. To the physician or the naturalist, the relation of woman to man is a series of opposites and contrasts". Women and men began to be seen as polar opposites and each sex was compared in relation to the other. Gender, prior to the eighteenth century, was not prescribed upon individual; a man could be physically male, but he could have a feminine gender identity. This was seen as being normal and even acceptable. With the switch to the two sex model, differences that had been expressed with reference to gender now came to be expressed with reference to sex and to biology.

The one sex theory
According to Laqueur, prior to the eighteenth century it was acknowledged that there were physical differences between the sex organs of men and women, but these differences were never made to be of significance; "no one was much interested in looking for evidence of two distinct sexes, at the anatomical and concrete physiological differences between men and women, until such differences became politically important." Until the beginning of the eighteenth century, Laqueur claims, the one sex model dominated medical and philosophical literature and there was a web of knowledge to support it.

Laqueur uses examples from ancient thinkers to help support his claim to the dominance of the one sex model prior to the eighteenth century. He mentions Galen who asks us to "think first, please, of the man's [external genitalia] turned in and extending inward between the rectum and the bladder. If this should happen, the scrotum would necessarily take the place of the uterus with the testes lying outside, next to it on either side." For Galen, "women have exactly the same organs as men, but in exactly the wrong places" Women are seen as less perfect versions of men, albeit still a version of them. Laqueur provides us with Galen's interesting comparison between the eyes of a mole and the genitals of a woman. For Galen "the eyes of the mole have the same structures as the eyes of other animals except that they do not allow the mole to see. They do not open…so to do the female genitalia 'do not open' and remain an imperfect version of what they would be were they thrust out." There were very few specific words associated with either male or female anatomy at the time of Galen. The ancients "regarded organs and their placement as epiphenomena of a greater world order". The absence of words associated with female anatomy shows that people did not want to see a difference between the male and female body. Laqueur argues that philosophers like Aristotle share Galen's views about the one sex model. Aristotle was committed to the idea of there being two different sexes, but he saw males and females as having certain roles in society, and these roles were not necessarily tied to their bodies. Aristotle said that "all of the male organs are similar in the female except that she has a womb, which presumably, the male does not." Laqueur believes that men and women were seen as comparable variations of one type of sex; that there were many genders at this time, but there was only one sex.

The two sex theory
"One Sex Two Sex Theory" claims that the switch from the one sex model to the two sex model created the foundations of gender as we know them today. The explanations for this shift are both epistemological and political. In terms of the epistemological, in the beginning of the eighteenth century, experts with authority were determining what was natural and what was not. Michel de Montaigne, a writer during the French Renaissance, writes in his Travel Journal, about a group of young girls who dressed up like males and led their lives as males. For him, this was seen as perfectly normal and that "there is no ontological sex, only organs assigned legal and social status". In the two sex model though, these experts wanted to create a link between biological sex and theoretical gender and anything transgressed these boundaries was seen as being abnormal. Although it was thought in the one sex model that feminine men may lactate and that "almost all the men have a great quantity of milk in their breasts", the notion interconvertibility of fluids among men and women was thrown out the window in the two sex model. Sex became related to physical facts and the uterus became a justification for the status of women. Gender roles became institutionalized and what was meant to be male or female was based on what the experts thought was natural. Philosophers like Rousseau supported this view and he saw women as being relegated to the private sphere as wives and mothers while men dominated the public sphere.

"One Sex Two Sex Theory" also sees politics as helping to bring about the dominance of the two sex model. There were endless struggles for power and position occurring between and among women. In order to have power over women, men would use sexual anatomy and sexual differences to support their superiority. The subordination of women by men began with the hierarchical ordering of their bodies and ended with their firmly defined gender roles. Thus, "women's protected and conservative role in the household and society was justified by arguments preordained function." Sex was seen as being a major battleground during the French Revolution and "the creation of a bourgeois public sphere...raised with a vengeance the question of which sex(es) ought legitimately to occupy it." Articulate men were the ones who brought about biological evidence to support the notion that women were "unfit for the chimerical spaces that the revolution had inadvertently opened" and thus propagated the notion that women were inferior to men.

The one sex theory
Renaissance anatomical illustrations depicted a woman as a man turned inside out. Male and female organs were often depicted side by side to demonstrate their correspondence to one another. Anatomist and physician Andreas Vesalius, represented women's organs as versions of man's in all three of his influential works. The vagina was often depicted as long, phallic and almost indistinguishable from a penis. Representation of the anatomical difference between men and women were independent of the actual structures of these organs and "ideology, not accuracy of observation, determined how they were seen and which differences would matter." Often, the only way to distinguish a female set of organs from a male set of organs would be if the illustrator were to cut away the front of what appears to be a womb in his drawing to reveal a child inside. This is because "the more Renaissance anatomists dissected, looked into and visually represented the female body, the more powerfully and convincingly they saw it to be a version of the males"

Physiologically, the one sex model explains that "in the blood, semen, milk and other fluids of the one sex body, there is no female and no sharp boundary between the sexes" (35) Different levels of each of the fluids are what would determine gender. The body was also seen as composed of four humours: cold, hot, moist, and dry. Just like with fluid composition, individuals varied in the humoral composition as well. "Though women were always dominated by cold and moist humours, and men by hot and dry humours, difference in sex were seen as differences of degree." In terms of reproduction in the one sex model, the sex of the child produced by a couple was based on the intermixing of the fluid of a couple. Both males and females were thought to emit a sperm like substance during intercourse. If both partners produce a strong sperm, then a male will result; if both produce weak sperm, a female is born; and if in one partner the battle has gone to the weak and in the other to the strong, then the sex of the offspring is determined by the quantity of sperm produced". It was also thought prior to the eighteenth century by people such as Galen, that in order for a woman to get pregnant, she must have an orgasm.

The two sex theory
Scientific advancements in the eighteenth century were not reason enough to bring about the two sex model. Knowledge about the differences in the male and female anatomy had been around since antiquity, but many people chose not to focus on the differences, but rather the similarities. In the eighteenth century "distinct sexual anatomy was adduced to support or deny all matter of claims in a variety of specific social, economic, political, cultural or erotic contexts." In the Eighteenth century people deliberately tried to find differences between the sexes and "wherever boundaries were threatened or new ones erected, newly discovered fundamental sexual differences provided the material".

In the eighteenth century, anatomists began to produce a female skeleton to demonstrate that women and men are not only different on the inside, but on the outside as well. Gradually, the genitals of the female anatomy began to move on the anatomical illustrations and the vagina began to look less penis like. Anatomical illustrations "are representations of historically specific understandings of the human body and its place in creation and not only of a particular state of knowledge about its structures." The prevalent view during the eighteenth century was emphasizing difference among the sexes and the anatomical illustrations reflected this. Organs that used to be associated with both sexes started to have their own names as a result of the discovery of the sperm and egg. "'Testicle' could not stand alone to designate unambiguously the male gonad; it no longer carries the modifiers 'masculine' or 'feminine'. 'Ovary' not 'female stones' or 'testicle feminine' came to designate the female equivalent. " Language was important in the development of the two sex model. As soon as organs were given different medical names, they were seen to be markedly different from each other.

In terms of reproduction, in the two sex model it was now thought that the male sperm was superior to the female egg. Antonie van Leeuwenhoek discovered that the male ejaculate was not just liquid but "he detected innumerable small animals in the masculine sperm" and "sperm and egg could now stand for man and woman." The egg quickly began to be seen as just a source of nourishment for the sperm and the sperm was viewed as being far superior to the egg. Sperm and egg were seen as the distinct products of the different sexes and this view also filtered down into the animal and plant world. Plants became gendered and this sexual nature of plants became the basis for Linnaeus' classificatory system. It was said that "plant sex was so extremely gendered at its core that in his own day Linnaeus' taxonomy seemed quite indecent."

One sex theory
The idea of a woman having to have an orgasm in order to conceive was prevalent in the one sex model. It was thought by people such as Galen that in order for a woman to get pregnant, she must have an orgasm. When a woman would reach an orgasm, the mouth of her womb would open and suck up the male ejaculate like a sponge. It was thought that both males and females experience an orgasm during intercourse and that both released some sort of fluid, which would mix together and the two emissions would result in conception. If women have organs that resemble those of men, and since men obviously experience an orgasm, the woman must too. Women needed to orgasm to produce fluids during intercourse that would stir with the male ejaculate to conceive a child. Laqueur notes that "the fact that women had gonads like men, that they had sexual desires, that they generally produced fluid during intercourse and presumably showed signs of 'delight and concussion', all confirmed the orgasm/conception link." Albrechet von Haller, an eighteenth-century biologist, felt that male and female sexual experiences were the same. He felt this because to him the "analogy of the sexually aroused woman to the sexually aroused man seemed so commonsensical"

Two sex theory
As opposed to the one sex model, the two sex model thought that a woman could conceive without an orgasm. At the beginning of Making Sex, Laqueur provides us with the anecdote of a beautiful young woman who was in a deathlike coma. She was raped by a young monk and conceived a child. This story challenges the one sex notion that a woman needs to experience an orgasm in order to conceive. It was also thought prior to the eighteenth century that ovulation corresponded to sexual intercourse. Biologists at this time had very little knowledge of what actually governed the production of an egg. By saying that conception was not related to orgasm, sexual pleasure for women seemed to lose importance. When in the eighteenth century it became a possibility that "the majority of women are not much troubled with sexual feelings, the presence of or absence of orgasm became a biological signpost of sexual difference." Women were to be seen as passionless and not enjoying sex. There was biological evidence around at the time that parts of the female anatomy, specifically the clitoris "contributes a large share, and perhaps the greater part, of the gratification which the female derives from sexual intercourse." Laqueur says that it was "culture and not biology that was the basis for claims bearing on the role and even the existence of female pleasure. The body shifted easily in the eighteenth century from its supposedly foundational role to become not the cause but the sign of gender."

Sex socialized
The change from the one sex model to the two sex model helped to create a new understanding of gender in the meaning of human history. There is an "increasing differentiation of male and female social roles; conversely, a greater differentiation of roles and a greater female 'delicacy and sensibility' are [seen as] signs of moral progress." If men and women are seen as being physically different, than they must be treated differently as well.

In the two sex model, since there are physical differences between men and women, there must be differences in how they receive pleasure. Sigmund Freud tries to explain the functions of the clitoris by challenging the preconceived notions about it. Freud feels that "if we are to understand how a little girl turns into a woman, we must further follow the vicissitudes of [the] excitability of the clitoris." He sees the clitoris as being "the organ through which excitement is transmitted to the 'adjacent female sexual parts' to its permanent home, the true locus of a woman's erotic life, the vagina." For Freud he uses the analogy of the clitoris as "pine shavings [used to] set a log of harder wood on fire". For Freud, there is no real female interior if pleasure can transfer from the clitoris to the vagina. Freud tries to provide evidence for a vaginal orgasm and he makes it so a clitoral orgasm is seen to be adolescence. By downplaying the role of the clitoris, he makes women's sexual needs seen as being inferior and secondary to those of men. He says that "whenever a woman is incapable of achieving an orgasm via coitus, provided the husband is an adequate partner, and prefers clitoral stimulation to any other form of sexual activity, she can be regarded as suffering from frigidity and requires psychiatric assistance." In the two sex model, it is seen that Freud "must be regarded as a narrative of culture in anatomical disguise. The tale of the clitoris is a parable of culture, of how the body is forged into a shape valuable to civilization despite, not because of itself". Freud changed the meaning of the clitoris and contributes to the notion of the passionless woman.

Laqueur says that there was obvious evidence around in Freud's time that the clitoris was in fact the source of pleasure in women. François Mauriceau notes that the clitoris is "where the author of Nature has placed the seat of voluptuousness – as he has in the glans of the penis – where the most exquisite sensibility is located, and where he placed the origins of lasciviousness in women." The vagina on the other hand was seen as "a far duller organ" and "only the glands near its outer end are relevant to sexual pleasure because they pour out great quantities of a saline liquor during coitus, which increases the heat and enjoyment of women". By changing the meaning of the clitoral orgasm, Freud seems to be putting women in opposition to men and further assigning women to socially assigned roles. To say that a woman is supposed to orgasm through her vagina as opposed to her clitoris "works against the organic structures of the body." In Laqueur's "One Sex Two Sex Theory", he sees Freud as being instrumental in the sexual socialization of women. He feels that "the cultural myth of vaginal orgasm is told in the language of science. And thus, not thanks to but in spite of neurology, a girl becomes the Viennese bourgeois ideal of a woman." Sexual differences in "One Sex Two Sex Theory" become reasons for social differences among men and women.