Monday 1 June 2015

Discuss evolutionary explanations of human aggression including infidelity and jealousy (8+16)

Males can use both short term and long term mating strategies to maximise chances of reproduction. Long term strategies involve investing time and energy over a number of years supporting the mate in bringing up the child. Unless the man prevents the women from having relationships with other men, through mate guarding, he can never be certain he is the father of the child. Male sexual jealousy may therefore have evolved to prevent infidelity by women and reduce the risk of cuckoldry. 

Mate guarding may also be used in short term strategies. In the context of a 'one night stand' men can have sex with the female with little biological cost. They may then want to keep the female away from other males, in order for them to maximise the chance of their child being born, with the immediate motivator for this likely to be jealously. 

Shackleton et al demonstrated the link between mate retention, jealously and violence. A positive correlation was found between men using more mate retention techniques and more violence supporting the theory of jealously being linked to long term mate retention strategies. Within a committed relationship the female would have taken some of the male's resources, therefore he will show signs of jealously and violence in order to protect these resources. Methodological issues occur as questionnaires were used which may have affected the accuracy of responses therefore reducing reliability and validity of findings. This is a sensitive topic, and asking those to describe violence with current partners may lead to social desirability with participants responding in a way that will allow them to be viewed favourably by others, they may not be truthful in answers, therefore invalidating results. 

An important implication of research is early male retention strategies could be used as an early warning that males may show violence towards the female partners in the future. This findings from such studies could be used to alert friends and family to danger signs which could lead to future aggressive acts.

Camilleir and Quinsey found men convicted of raping their partners were more likely to have experienced cuckoldry risks previously, compared to men convicted of non-sexual abuse. This supports an evolutionary explanation suggesting jealously can reduce risk of mate infidelity as if they sexually assert themselves this will reduce the risk of the female having an affair and reducing the risk of cuckoldry and investing resources in offspring which isn't theirs. However, individual differences are not accounted, confounding variables such as innate aggressive tendencies, may increase chances of men acting physically or sexually aggressive. Today we are not exposed to the same evolutionary pressures which once were, so assuming such pressures still affect our behaviour is reductionist.

Both Shackleford, and Camilleir and Quinsey's studies highlight that jealousy or the partners' infidelity can lead to increased levels of aggression. However, such research focuses towards male mate retention strategies and male violence against women. Although, women have also been observed to engage in aggressive mate retention strategies. Research suggests women carry out violent behaviour towards their partners just as often as men do, suggesting possible gender bias in majority of research.

Evolutionary determinism ignores the role of free will, however some evolutionary psychologist argue free will is an adaption as it improves our chances of survival for example evolutionary pressures give men the drive to use mate retention strategies, but they chose which ones they use. However, such an approach cannot explain why individuals use different strategies when faced with the same issue. Problems also arise as this approach, of accepted could take responsibility away from aggressive male retention strategies, providing an excuse for behaviour. 


Evolutionary explanations of infidelity and jealously can be taken to suggest aggression is entire due to evolved responses, which is reductionist. Therefore suggesting aggression is purely due to evolution is largely speculative and cannot provide a suitable explanation for our complex social interaction processes.

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