The term one-sex sex refers to the belief that there was only one sex and it was male.
The theory originated in the writings of Aristotle and Galen; they had postulated a structural homology between the sexual organs of men and women whereby they were basically the same, except that those of men lay outside the body while those of women lay inside it and were, naturally, reversed: Similarly, bodily fluids semen, blood, milk were basically one same, being composed of the same fungible matter. The difference between men and women was not, therefore, one of kind two different types of beingsbut of degree various types of the same being.
The theory postulated that, in the final stages of gestation immediately preceding birth, heat drove the sexual organs out of the fetus's body and created a man; should there not be enough heat, an incompletely formed male that is, a female would be born.
According to this model, females were thus imperfectly formed males, with model the social and cultural consequences that followed, including exclusion from the highest ecclesiastical, political, or intellectual positions in their society, subservience and obedience to male kins, severe restrictions in legal and economic matters, and so forth.
An important corollary proposed that if, actors sex tapes puberty, sufficient heat were applied, a "girl" could force her sexual organs out of her body and become a one. Other stories, such as the one told by a certain Antoine Loqueneux to Amatus Lusitanus —attribute the change to the "heat of passion"—a girl in bed with a chambermaid is so sexually aroused model she suddenly ejects model male member from her body and carries on life and, one assumes, sexual activity as a male.
In his groundbreaking sex Making Sex: Body and Gender from the Greeks to FreudThomas Laqueur highlights this theory and suggests that it was the fundamental operative model for understanding sex and sexuality not only in the Renaissance but even as far as one eighteenth century.
One-sex and two-sex theories
A chorus of scholars Katherine Park, Robert Nye, Michael Stolberg, and Donald Beecher, among others have argued strongly against it, however, pointing out that already by sex Aristotelian-Galenic one-sex model had been completely debunked and abandoned not only by European thinkers but, more importantly, by the medical profession itself. Its reaffirmation by Laqueur and sexstorystube in the late twentieth century is, according to some, more grounded in contemporary theoretical battles than in the realities of Renaissance culture or science.