In this blog post, we will examine the evidence supporting the evolutionary theory of rape and the counterarguments against it, and review the logic behind each claim.

How did the evolutionary theory of rape emerge?

Rape, a serious sexual crime, is a social problem that has historically been found in nearly all human societies. For this reason, research aimed at explaining the root causes of rape in human society has been conducted consistently for a long time across various academic disciplines. In particular, discussions seeking to explain rape from the perspective of evolutionary biology began to gain widespread attention following the publication of a book by Randy Thornhill and Craig T. Palmer in 2000. They raised the possibility that rape might be an adaptation resulting from natural selection.
In evolutionary biology, natural selection refers to the process by which, over a long period of time, traits advantageous for survival and reproduction are passed on to subsequent generations, while those that are not gradually disappear. Traits that emerge as a result of this natural selection are called adaptations. In other words, some evolutionary biologists argue that the phenomenon of rape may also be the result of traits that have been selected over a long period of time in a direction favorable to survival and reproduction.
This claim sparked significant controversy in the academic community as soon as it was published. While many researchers supported it, others strongly criticized it, and various counterarguments and rebuttals continue to this day. Despite this controversy, I believe that rape can be explained from the perspective of adaptation, as argued by Son Hill and other evolutionary theorists. In this article, I will examine the evidence on which evolutionary theory bases its claim that rape is an adaptation, and how the counterarguments raised against this claim can be addressed.
I view the phenomenon of rape in human society as the result of natural selection, specifically in terms of reproduction rather than survival. In fact, it is a clear fact that when forced sexual intercourse occurs—whether involving men or women—it results in the possibility of pregnancy. Furthermore, according to the basic principles of evolutionary theory, traits that are advantageous for survival and reproduction can be passed down to future generations through natural selection; therefore, it is possible to interpret rape as a product of such an adaptation.
However, those who oppose this logic argue that the premise that rape is advantageous for reproduction is itself problematic. As evidence, they point out that even when rape victims become pregnant, there are not many cases that lead to childbirth and child-rearing; instead, choices such as abortion or abandoning the child after birth are sometimes made. Considering this reality, they argue that rape may actually be disadvantageous for reproduction compared to consensual sexual intercourse.
So, can these cases truly serve as evidence that rape is not an adaptation? If we examine the arguments of evolutionary theorists in a bit more detail, it is difficult to conclude that this is necessarily the case. Evolutionary theory argues that not all humans share the same disposition toward rape, but rather that men and women have been subject to natural selection in different directions.
First, considering men, they possess the biological ability to produce offspring simply by having sexual relations with women. From this perspective, it is interpreted that it is advantageous for men to pass on their genes by having sexual relations with as many women as possible. In particular, since rape offers the possibility of successful reproduction without assuming the responsibility of raising offspring, evolutionary theory suggests that this tendency may have been selected for by natural selection. Therefore, it explains that even if such a tendency does not necessarily benefit the reproduction of human society as a whole, it could have been maintained from the perspective of individual reproduction.
The situation is different for women. Women must bear the high biological costs of pregnancy and childbirth, and they cannot conceive new offspring during pregnancy. Consequently, carefully selecting a partner who can also help raise the offspring is crucial for both survival and reproduction. For this reason, reproduction through rape is actually disadvantageous to women, and evolutionary theory explains that women’s tendency to avoid rape was also subject to natural selection. This perspective is seen as capable of explaining, to some extent, the behaviors mentioned earlier—such as a victim’s decision to terminate a pregnancy or abandon a child after giving birth.

Another Counterargument Against the Evolutionary Theory of Rape

Another major argument criticizing the evolutionary perspective on rape is that rape is merely the result of distorted sexual desire or social stress, and that evolutionary theorists are overinterpreting it by framing it as an evolutionary phenomenon. However, a review of existing research suggests that there are aspects of rape that cannot be easily explained by sexual desire or social stress alone.
First, let’s examine the claim that rape is simply an expression of sexual desire. Existing studies have shown that there is no significant difference in average levels of sexual desire between men and women. Of course, men generally tend to be physically stronger than women, but since physical ability varies from person to person, there are exceptions.
If rape were caused solely by sexual desire, it would follow logically that a certain proportion of cases should involve women raping men. However, actual crime statistics show that the vast majority of rape cases involve male perpetrators. It should be noted, however, that figures such as the “99.9%” cited in the original text do not align with current official statistics, and there are variations depending on the country and statistical criteria. Nevertheless, the fact that men account for an overwhelming proportion is consistently confirmed in crime statistics across various countries. This gender disparity is difficult to explain solely by sexual desire and is used as evidence to support evolutionary arguments suggesting the possibility of differing evolutionary tendencies between men and women.
The claim in the original text that “35% of male college students in South Korea responded that they would commit rape if they weren’t caught” is also difficult to accept as a general fact today. This figure is known to be based on a limited study conducted long ago and a specific survey, and critics have consistently pointed out the limitations of generalizing it to the entire college student population or to men in general. Therefore, it is difficult to prove or disprove evolutionary theory based on this single example alone.
Evolutionary biologists also present counterarguments based on animal examples regarding the claim that rape is an expression of social stress. While forced copulation is observed relatively frequently among orangutans—a species evolutionarily close to humans—it is difficult to explain this behavior solely through social stress. Evolutionary biologists suggest that such behavior may stem from the distinct evolutionary characteristics and reproductive strategies of each species.
However, even within modern evolutionary biology, many scholars caution against directly explaining or generalizing human rape behavior based solely on these animal examples. This is because sexual crimes in humans are understood as a phenomenon resulting from the complex interplay of various factors—including not only biological factors but also sociocultural environments, power dynamics, individual psychology, and upbringing.

Why isn’t rape more common in human society?

Based on the evidence examined so far, evolutionary theory explains that men have been subject to natural selection for certain reproductive tendencies, while women have been subject to natural selection for tendencies to avoid them. If such tendencies exist, then why does rape not occur routinely in human society but remains a crime committed by a very small minority? This is a question that can certainly be raised from a perspective opposed to evolutionary theory.
I believe this question can be explained from two perspectives.
The first is human will and social norms. Evolutionary theorists are merely suggesting the possibility that men may possess certain tendencies; they do not claim that these tendencies are necessarily translated into action. In ‘The Selfish Gene’, evolutionary biologist Richard Dawkins stated, “We have the power to resist our genes, and we humans are the only beings on this earth capable of rebelling against the tyrannical rule of selfish self-replicators.”
In other words, the general view among evolutionary theorists is that, unlike other animals, humans are beings capable of suppressing their instincts in accordance with social norms and moral judgment. For this reason, they explain that, unlike some animals that act solely on instinct, rape does not appear as common behavior in human society.

On what grounds is the evolutionary theory of rape proposed, and what are the counterarguments?

The second aspect is that of social retaliation and punishment. Even if we assume that a man can increase his reproductive success through rape, he must take on a very high risk if he actually carries out the act. This does not refer solely to legal punishment in modern society. It is presumed that even in primitive societies—which make up the majority of human history—men who committed rape would have faced retaliation from the victim’s family or community. This situation suggests that while rape may offer certain benefits in terms of reproduction, it can actually be disadvantageous in terms of survival.
Since rape carries such survival risks, evolutionary theory suggests that not only the tendency to attempt rape but also the tendency to suppress it may have been subject to natural selection.
Evolutionary biologists also cite animal examples to support this explanation. They note that while the rate of forced copulation is relatively low among highly social animals, it is observed more frequently among animals that lead relatively solitary lives. They explain that in species living in groups, the risk of social sanctions and retaliation increases, which may lead to behaviors that suppress forced copulation.
However, modern animal behaviorists also point out that since social structures and reproductive strategies vary greatly among species, one must be cautious about directly applying or generalizing the behavior of specific animals to human society.

How should we view the evolutionary theory of rape?

We have now examined the evolutionary perspective that explains rape as an adaptation, its supporting evidence, and the various counterarguments and questions raised regarding it. Attempts to explain rape through evolutionary theory represent a school of thought aimed at understanding human behavior from a biological perspective, and research seeking to explain certain aspects of human behavior continues to this day.
However, the view that it is difficult to explain rape through a single cause is now more widely accepted in academic circles. Not only evolutionary biology but also various academic fields—including psychology, sociology, criminology, and cultural anthropology—view sexual crimes as arising from the complex interplay of multiple factors, such as power dynamics, sociocultural environments, individual psychology, upbringing, and awareness of gender equality. Therefore, it is generally understood that evolutionary theory is merely one hypothetical approach among these various explanations.
It is also necessary to clearly distinguish that attempts to explain rape from an evolutionary perspective do not equate to justifying or condoning rape. The fact that a phenomenon can be explained biologically is entirely distinct from whether it is ethically justified. Science seeks to explain why phenomena occur, while society regulates and punishes such acts through law and ethics.
Of course, evolutionary theory alone cannot explain every aspect of the crime of rape, and much further research and refinement will be needed. Nevertheless, it is significant that these discussions have made it possible to examine the social problem of rape not only from humanities and sociological perspectives but also from a biological perspective. It is hoped that as research from various academic fields continues to accumulate, it will contribute to a more accurate understanding of the causes of sexual crimes and their prevention.