The sexual behavior was defined as a complex of responses directiv associated with genital stimulation and homo or heterosexual copulation, regardless ofits role in species preservation. For all these happened is necessary the achievement of sexualisation at the genetic, and gonadic levels, at the internal and externai genitals, but also at the encephalic level, and, finally, at the behavioral level. Human sexual behavior implied different levels of central nervous system, beginning with the inferior one, like medidar level, where the parasympathetic system play a role on excitation and on the plateau phase that appears on the sexual cycle, and the sympathetic system controls the orgasmic phase. Subcortical levels, including the hipocampus and the amygdala participate at the appetive phase and at the sexual motivation. In human, because of the development of the thalamo-cortical component, the sexual behavior gets on hedonic and psycho-social meaning. Connection between temporal and frontal cortical areas, hypothalamic areas, and limbic nudei may be responsible for various complex emotional, behavioral and physiological aspects of sexual functioning. Sex hormons influence sex typing of the brain during fetal development. Sex hormons or a similar hormonal has a role in neurodevelopmental basis for human sexual orientation. These hormons interact with receptors in the hypothalamus and amygdala. The studies show that the same neurophysiological reactions appear like responses both to homo or heterosexual stimulations and to masturbation.
KEYWORDS; human sexual behavior, neurophyziology, sexual hormons, human pheromons