Lehmann and Feldman (2008)
Men who are stronger and more aggressive will win wars and survive to pass on genes, leading to an increasingly aggressive species. Two traits that have evolved in humans that determine the likelihood of conflict:
- Belligerence
- Bravery
Men with both traits have a higher chance of winning.
Kelly and Dunbar (2001)
Claim that bravery or heroic acts my have evolved owing to a female preference for brave, risk prone men. It is more likely that males that are willing to commit such 'brave' acts will also protect them in times of danger.
Farthing (2005)
Surveyed whether men and women desired physical risk tears as partners. The result was that only when the risks were considered 'brave' there was a significant advantage in mate selection. Physical risks that were not considered 'brave' were not an advantageous mate quality.
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