In this blog post, we will examine the evolutionary biological debate over whether male rape is a biological adaptation, along with the critiques of that view, after proofreading and editing the text.
The Concepts of Rape and Biological Adaptation
According to international crime statistics published by the United Nations Office on Drugs and Crime (UNODC), sexual violence crimes continue to occur in countries around the world, though the patterns of occurrence vary by country. Among sexual crimes, rape is the most representative and serious offense. Rape refers to sexual acts performed unilaterally against the will of one party, rather than sexual acts carried out by mutual consent. Many people believe that only women are victims of rape, but this is not true. There are cases of sexual violence committed by women against men, as well as cases where men commit such crimes against other men. In line with these social changes and the broadening of public awareness, the Criminal Code of the Republic of Korea has been amended so that anyone, regardless of gender, can now be a victim of rape.
Why does rape occur? A significant number of rapists claim that their crimes were spontaneous. This is sometimes interpreted to mean that they committed the crime while unable to properly control their sexual impulses. In psychology, rape is sometimes interpreted as a behavior intended to satisfy a desire to dominate the vulnerable and to derive pleasure from the process. Criminal psychology also explains it as the result of a distorted sense of victimization toward women or society being expressed in a misguided manner. In contrast, evolutionary biologists Randy Thornhill and Craig T. Palmer interpreted rape from a very different perspective in their jointly authored book, ‘The Natural History of Rape: The Biological Basis of Sexual Coercion’. Professor Thornhill argued that male rape behavior could be an “adaptation.” So, what exactly does “adaptation” mean in this context?
Before discussing whether male rape is an adaptation, it is necessary to clearly understand the meaning of adaptation as defined in biology. In everyday language, the term “adaptation” refers to becoming accustomed to a new environment and generally carries a positive connotation. However, in biology, “adaptation” refers to the result of natural selection. It describes a form or function that is suited to an organism’s environment; if such a trait is selected during the evolutionary process and acts to the organism’s advantage in terms of survival and reproduction, it is called an adaptation. For example, during the course of evolution, horses with molars suited for chewing grass and legs capable of running quickly to escape predators were the ones that survived. This is a classic example illustrating biological adaptation. Although organisms are extremely diverse, individuals with traits suited to their environment survive through natural selection and pass those traits on to future generations.
Now we can understand the meaning behind the claim that “male rape is an adaptation.” This claim suggests that rape is not merely an act of violence or a culturally learned behavior, but rather an adaptive behavior that has been selected by natural selection to enable men to reproduce more successfully. So, is male rape truly a biological adaptation? Many evolutionary biologists have long debated this question. Professor Jang Dae-ik’s book ‘Darwin’s Table’ details the fierce debate between adaptationists and anti-adaptationists over whether rape is an adaptation. What evidence did they use to support their respective arguments?
Arguments of Adaptationists and Anti-Adaptationists
As explained earlier, adaptationists do not view male rape as mere violence. They argue that rape is an adaptive behavior that provides reproductive opportunities for males who have difficulty finding mates. Citing the fact that a significant proportion of rape victims are women of childbearing age, they interpret rape as a sexual behavior rather than inherently violent. They also argue that biological adaptation and ethical evaluation are separate issues. While there is no disagreement that rape should be ethically condemned and punished, they maintain that the scientific question of why rape occurs must be distinguished from ethical judgments. They contend that understanding the causes of rape from an evolutionary biological perspective can actually help prevent rape crimes more effectively.
In contrast, anti-adaptationists do not view rape as a biological adaptation. Rather, they interpret rape as a byproduct stemming from male sexual desire. They also offer a different interpretation regarding the composition of victims. They argue that a significant proportion of child victims are incapable of pregnancy, and that when considering the patterns of victimization among both non-fertile and fertile women, it is difficult to view rape as a behavior that evolved exclusively to target fertile women. Furthermore, they do not agree with the claim that understanding rape as an adaptation from an evolutionary biology perspective helps prevent crime. They point out that perspectives such as advising women not to wear revealing clothing risk stemming from a mindset that presupposes rape as a natural product of male biology. Furthermore, they criticize adaptationism by arguing that male-on-male rape, incest, and child sexual abuse cannot be adequately explained by adaptation theory alone.
Is Rape a Biological Adaptation?
So far, we have examined the arguments of adaptationists and anti-adaptationists regarding whether male rape behavior constitutes a biological adaptation. Although this is a highly contentious debate, there are several limitations to categorically asserting that male rape behavior is a biological adaptation. In this article, I will explain why rape behavior is not a biological adaptation and examine the evidence by reviewing the arguments of adaptationists and the counterarguments against them.
To claim that rape is an adaptation implies that it is a behavior that evolved to aid male reproduction and benefit the survival of the species. However, it is difficult to view rape as a behavior that is necessarily advantageous for reproduction and the survival of the species. First, let us consider the perspective of rape victims. Victims may experience severe psychological trauma and a fear of men, and they are likely to avoid relationships with the opposite sex afterward. These consequences may work against, rather than in favor of, reproduction and the survival of the species. Furthermore, from the perspective of society as a whole, the occurrence of serious crimes such as rape increases social anxiety and undermines the safety and trust within the community. This can become a factor that hinders the stable lives and environments of society’s members. Therefore, from these perspectives, it is difficult to view male rape as a biological adaptation.
Of course, adaptationists may raise counterarguments to this claim. In response to the assertion that rape is not beneficial for species reproduction, they may cite research findings indicating that the likelihood of pregnancy resulting from rape is higher than that from consensual sexual intercourse. Based on these statistics, adaptationists may argue that rape is, in fact, a behavior favorable to species survival because it ultimately increases reproductive potential.
However, even if there is a possibility of reproduction when considering the act of rape in isolation, the perpetrator cannot escape subsequent social and legal consequences. Since rape is a crime, it is subject to investigation and trial, and if found guilty, the perpetrator will face criminal punishment. Furthermore, the perpetrator will face severe social condemnation and a loss of trust. Under these circumstances, it is highly likely to become extremely difficult to form normal social relationships with others or to find a spouse and gain additional reproductive opportunities. Ultimately, from a broader perspective, rape can be viewed not as a behavior that increases long-term reproductive potential, but rather as one that diminishes it. Therefore, considering these risks, it is difficult to regard rape as a biological adaptation.
In response, adaptationists might argue that rape is an adaptation that contributes to reproduction and the survival of the species, as socially vulnerable individuals who lacked opportunities for sexual relations could secure reproductive opportunities through rape. However, this argument is also difficult to find sufficiently persuasive. Among rape victims, there are quite a few—such as children—who are incapable of pregnancy; and when postmenopausal women are included, the proportion of victims unable to reproduce increases even further. Rape targeting non-fertile victims does not aid reproduction in any way. Since this proportion is too high to be dismissed as a mere exception, it is unreasonable to generalize rape as an adaptive behavior for reproduction.
Adaptationists sometimes explain these cases by arguing that rape of non-fertile women is an exception due to situational factors, and that since rape itself occurs through random selection, it does not distinguish between fertile and non-fertile women. However, this explanation is also not sufficiently convincing. If we accept the premise of random selection, rape becomes less a behavior aimed at species preservation and reproduction and more the result of a chance expression of sexual desire. Rather, it is more likely that sexual desire itself can be viewed as a biological adaptation. Sexual desire drives animals, including humans, to engage in sexual behavior, which in turn leads to reproduction and the preservation of the species. From this perspective, it is more appropriate to understand rape not as a biological adaptation but as a byproduct arising in the process of sexual desire manifesting itself.
Questions are also raised as to whether the act of rape can be viewed as a biological trait in the first place. A biological trait refers to an observable characteristic that is inherited. Inherited physical characteristics, such as a polar bear’s white fur or a giraffe’s long neck, are prime examples. However, rape is a behavior, not a physical characteristic. It is difficult to view behavior as a universal trait necessarily shared by a specific species. Even a person who leads a very virtuous life can commit a crime under certain circumstances and motivations; conversely, even someone who appears aggressive may never commit rape in their lifetime. Considering these points, the very premise of adaptationism—which assumes rape is a heritable trait—is called into question.
Ultimately, the arguments put forward by adaptationists have several limitations. Their reasoning alone cannot sufficiently explain various cases, such as male-on-male rape or incest. Therefore, rather than viewing male rape as a biological adaptation, it is more persuasive to interpret it as a byproduct resulting from the combination of strong sexual desire with various social and psychological factors. Richard Dawkins, a leading figure in adaptationism, has also cited examples of phenomena that were once considered byproducts but may in fact be adaptations. Conversely, however, it is equally necessary to thoroughly examine the possibility that some phenomena previously regarded as adaptations may actually be byproducts.
