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The theory predicts that preferred mate choices have evolved to focus on reproductive potential and reproductive investment of members of the opposite sex.

This theory predicts both intrasexual selection and intersexual choice due to differences in parental investment; typically there is competition among members of the lower investing sex (generally males) over the parental investment of the higher investing sex (generally females) who will be more selective in their mate choice.

These two theories explain why natural and sexual selection acts slightly differently on the two sexes so that they display different preferences.

For example, different age preferences may be a result of sex differences in mate values assigned to the opposite sex at those ages.

A study conducted by David Buss investigated sex differences in mate preferences in 37 cultures with 10,047 participants.

In all 37 cultures it was found that males preferred females younger than themselves and females preferred males older than themselves.

As well as asking participants a number of questions on mate selection criteria, they also had to provide the oldest and youngest partner they would accept.

Another study also showed a higher divorce rate as the age difference rose for when either the woman was older or the man was older.

In August 2010, Michael Dunn of the University of Wales Institute, Cardiff completed and released the results of a study on age disparity in dating.

Dunn concluded that "Not once across all ages and countries ...

Male chimpanzees tend to prefer older females than younger and it is suggested that specific cues of female mate value are very different to humans.

Buss attributed the young age preference for females to the cues that youth has.

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