In this blog post, I will examine whether male rape behavior constitutes an evolutionary adaptation, summarize the main arguments for and against this view, and present my personal perspective.

Definitions of Rape and Adaptation

First, we need to define the terms. Rape refers to sexual intercourse carried out through violence or coercion without mutual consent. Consensual sexual intercourse in exchange for money or other compensation is not included in this definition. Meanwhile, “adaptation” refers to a trait that has become ingrained in human nature over a long period of time because it provides a direct advantage for survival and reproduction. Unlike physiological byproducts that arose by chance during the evolutionary process, an adaptation must provide a direct survival or reproductive benefit.

Arguments Viewing Rape as an Adaptation

I believe there is a possibility that male rape behavior is an evolutionary adaptation. The most compelling evidence is the fact that rape has persisted over a long period of time. Behavioral ecologists have interpreted rape as an adaptation from the perspective that it increases men’s reproductive success. At the same time, they make it clear that rape is a serious crime, both morally and legally. The core argument is that rape is not essentially a violent impulse, but rather a behavior with sexual and reproductive goals.

Rebuttals and Counter-rebuttals to the Statistical and Adaptive Arguments

One of the most common counterarguments to the claim that rape is advantageous for reproduction is that a significant proportion of rape victims are women who are not of childbearing age. The argument goes that if it were a behavior aimed at reproduction, women of childbearing age should constitute a larger proportion of the victims. In response, I offer two rebuttals. First, the statistical data used may not be representative of the general population. For example, Korean police statistics report that approximately 90% of female rape victims were of childbearing age between 2011 and 2012. Second, adaptation does not always remain in a perfectly optimized form. Many products of evolution are inefficient and produce side effects. Just as the human eye has blind spots due to structural limitations, behaviors originally formed to be more advantageous for reproduction can be misdirected and manifest toward non-reproductive targets.

Arguments and Limitations of Viewing Rape as a Product of Violence

The opposing side views rape as inherently violent and an expression of domination and power. Some scholars classify rape into various types—such as masculinity-affirming, power-seeking, anger-displacement, sadistic, and opportunistic—and argue that the motives for rape, such as the desire for domination, revenge, or anger, are unrelated to sexual desire. However, the following questions remain regarding this view. Why is the target for expressing the desire for domination primarily limited to women? Given that other vulnerable groups, such as male children or people with disabilities, also exist, why is the focus on women? Furthermore, unlike simple violence, why must rape involve sexual intercourse to satisfy the desire for domination? These points are difficult to fully accept based solely on explanations relying on the perpetrator’s statements.

Further Rebuttals to the Claim of Violence

There are several points to counter the interpretation that views rape as a means of violence. First, while robbers primarily use violence to obtain goods or money, rape differs in purpose, as it uses violence as a means to achieve sexual intercourse. Second, citing cases where victims are killed during rape is insufficient to conclusively label rape as an expression of violence. Rape-murder is an extreme and rare exception; most rapes are aimed at sexual acts from the outset, not murder.

Class and the Evolutionary Interpretation of Rape Behavior

Another counterargument raised when viewing rape as an adaptation is the question: “How did the genes of rapists survive?”
The argument is that not everyone commits rape, and this conflicts with the common perception that it is “inferior” men who commit rape. This counterargument becomes easier to understand when considering the historical context. In past class-based societies, high-class men often received lenient punishments or immunity even when they committed rape. Conversely, low-class men faced a higher risk of punishment for rape and may have refrained from the act relatively more often. Therefore, the disparity in punishment likely served to deter rape by high-class men to a lesser extent, and it is possible that their behavioral patterns were passed down within their groups. Furthermore, while it is not necessarily true that those in higher classes possessed only “superior” genes, it is important to consider that groups that rose to socially advantageous positions generally had greater opportunities for survival and reproduction than ordinary groups.

An adaptive interpretation of rape against other communities (in wartime)

Collective and organized rape occurring during war has been documented for a long time and served as a means of attacking other communities. In times of war, rape inflicts psychological trauma on the women of the opposing community and weakens the men’s will to resist; as a result, it can undermine the social cohesion of the opposing group in the long term. Furthermore, children born from rape may experience confusion regarding their identity, potentially reducing the likelihood of retaliation by the next generation. From this perspective, wartime rape may have produced outcomes favorable to a group’s survival and reproduction.

Intra-group Rape and Historical Context

On the other hand, when considering whether intra-group rape was advantageous for reproduction, one must take historical circumstances into account. In the past, abortion and contraception were less developed than they are today, and many religious cultures prohibited abortion; therefore, a pregnancy resulting from rape could clearly be a net benefit in terms of reproduction. Furthermore, in slave societies or class-based societies, victims from lower classes often did not receive “formal” protection, leading to cases where rape went unpunished or was treated leniently. These sociocultural factors created conditions in which rape could have benefited reproduction and survival in specific eras and cultures.

Conclusion

Rape is a clear moral and legal crime and an act that cannot be tolerated in today’s society. However, from an evolutionary perspective, specific past environments and social structures may have provided conditions under which rape could have been advantageous for reproduction or group survival. Therefore, while male rape cannot be justified by today’s standards, it is difficult to completely dismiss the argument that there may have been adaptive elements within an evolutionary context. When discussing this issue, one must consider statistical, historical, and sociocultural factors, and must never downplay the perspective of the victims or the moral responsibility involved.