A study published in Evolution and Human Behavior explores why women commit infidelity. Evolutionary psychology debates the reasons for female infidelity. While male infidelity is often explained by the desire to increase reproductive success through multiple partners, women’s reproductive limits lead to different motivations. This has resulted in two main hypotheses: mate-switching and dual-mating strategies.
The mate-switching hypothesis suggests women cheat to find better long-term partners. On the other hand, the dual-mating strategy posits that women seek the best genetic material from an affair partner while keeping their primary partner for parenting support.
Researchers surveyed 254 heterosexual individuals from 19 countries using Prolific Academic. They assessed attraction in three areas—physical, personal, and parental—towards both affair and primary partners using established scales. Qualitative questions captured nuanced motivations for infidelity.
Women rated their affair partners as more physically attractive but less suitable as co-parents compared to their primary partners, supporting the dual-mating strategy. Contrary to the mate-switching hypothesis, women did not prefer their affair partners as long-term mates and kept distinct roles for each partner.
Therefore, women who cheat are often more attracted to their affair partners but see their primary partners as better co-parents suggesting women might cheat for “good genes” while relying on their main partners for parenting. Other reasons include relationship dissatisfaction, desire for variety, and revenge.
Interestingly, men showed similar patterns, seeking genetic benefits from affair partners while valuing primary partners for parenting. Murphy noted this was surprising but consistent with some past research.
The study also found diverse motivations for infidelity. Both men and women cited a desire for variety and new experiences. Many women mentioned relationship dissatisfaction, such as neglect and lack of emotional support. Some participants cited revenge, especially if their partner had cheated. Others sought to validate their attractiveness or secure additional resources, aligning with the multiple investors hypothesis.
Situational factors like stress, long-distance relationships, and substance influence also played a role. The authors emphasized that while infidelity can serve various evolutionary strategies, it does not justify the behavior.
While culturally and ethically, it would be wrong to cheat on a partner for many reasons, it is important to keep these theories in mind. Here is an idea, it is important for both sexes to continue to work and improve themselves to maintain both roles of both the good genetics and the good provider.
It is important to not just “let yourself go” once you are in a relationship but both partners should continue to improve themselves for themself and their partners.
M Murphy et al. Why women cheat: testing evolutionary hypotheses for female infidelity in a multinational sample. Evolution and Human Behavior (2024). https://doi.org/10.1016/j.evolhumbehav.2024.106595
