Studies conducted by Haselton and Galperin have found that sexual selection may have favored men who were too suspicious of their partners' faithfulness over those who were not suspicious enough. This is because men face potential evolutionary costs in:

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Men face potential evolutionary costs in raising children who are not their own, as this would mean investing resources in offspring that do not carry their genetic material. This concern over paternity certainty has been a significant factor in evolutionary psychology explanations for jealousy and mate-guarding behaviors.

Studies Conducted by Haselton and Galperin Have Found That Sexual