Resumo

SOLER, Franklin Giovanni. Evolution and sexual direction. Diversitas [online]. 2005, vol.1, n.2, pp.161-173. ISSN 1794-9998.

The Darwin's theory of evolution suggests the mechanism of natural selection in order to explain how species adapted, survived and evolved; and the mechanism of the sexual selection in order to explain its reproduction. In this way, he postulates that the adaptive characteristics are reproduced more successively than the maladaptative characteristics. In agreement with this, natural selection would have to favor heterosexualidad since this facilitates the reproduction and genes propagation. But what happens with the sexual direction that does not favor the Darwinian thesis (for example the homosexual dad) and why has stayed throughout time? The investigation in this area has been centered in hormonal aspects, cerebral differentiation and genetic, throwing incoherent results. Based * on the thesis that the human sexual direction, and especially homosexual direction, is as complex as to be described and explained so single by a model or a discipline. A revision becomes of the different investigation areas on sexual direction and the incapability of the evolutionary theories to give account of this is suggested.

Palavras-chave : evolution; direction sexual; natural selection; sexual selection; homosexuality; heterosexuality; bisexuality.

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