We've looked at two different evolutionary explanations for human behaviour. The 'division of labour' explanation states that in the EEA (Environment of Evolutionary Adaptiveness - the East African savannah 100,000 years ago) it was adaptive (beneficial in terms of survival) for our male and female ancestors to have different roles.
Here is the clip from 'Life of Mammals' of the persistence hunt.
Sexual selection is the selection of characteristics because they increase the chance of genes being passed on as a result of successful mating. Human partner selection and willingness to engage in casual sex can be explained by the difference in 'parental investment' in offspring between men and women.
Here is the presentation introducing evolutionary explanations.
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