Evolutionary theory-Traits that enhance successful reproduction are naturally selected. Women look for a man who can provide and have good health. Men look for signs of fertility and health, red lips, smooth skin etc.
Neurotransmitters-The chemicals in our brain have an impact on our emotions and this in turn influences our perceptions of others. For example, dopamine has been associated with pleasure seeking so setting the goal of finding a partner and being driven to achieve this, will give us a 'hit' of dopamine. This explains why humans are driven to form relationships.
Formation of sibling relatinships-Evolutionary theory can explain the close relationship found between siblings. Kin selection is when traits that enhance the survival of those with similar genes are also selected to promote the survival of a group's genes. This gives people a natural incentive to look after their siblings and to invest time/energy/resources to protect them.
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