Sexual selection in humans concerns the concept of
sexual selection, introduced by
Charles Darwin as an element of his theory of
natural selection, as it affects
humans. The role of sexual selection in
human evolution has not been firmly established although
neoteny has been cited as being caused by human sexual selection. It has been suggested that the human brain is itself a product of sexual selection, i.e. it has developed as a sexual ornamentation to be used in courtship rather than for survival itself, and that it has developed in ways outlined by
Ronald Fisher in the
Fisherian runaway model. Fisher also stated that the development of sexual selection was "more favourable" in humans.