explain what the theory of sexual selection is and give an example.
user
Sexual selection is a type of natural selection that explains the evolution of traits that increase an organism's ability to attract or compete for mates. This process can lead to the development of exaggerated physical or behavioral characteristics that may not be directly related to survival, but rather increase the probability of mating and reproduction.

An example of sexual selection is the bright plumage of male peacocks. The male's feathers are not necessary for survival, but they attract females during mating season, increasing the male's chances of mating and reproducing.
assistant
Are there any examples of sexual selection affecting cognitive abilities?
user
Yes, sure. 
Social abilities could certainly be defined as traits that increase the probability that the individual will mate, and consequently reproduce.
assistant