In the preceding chapters, I have given a summary of current knowledge of the stimulus control of sexual incentive motivation and copulatory behavior in some mammalian species including the human. Although knowledge is still lacking in some respects, we have a reasonably clear picture of how external stimuli control sexual behaviors. Now we will enter the world under the skin, particularly the world inside the skull, and there we will try to discover the tangible bases of the central motive state. It is not that I will try to materialize an abstract concept, but I will try to show that the brain needs to be exposed to some hormones in order to react to external stimuli with sexual responses, and I will try to show that these hormones act in specific brain structures when enabling them to these reactions.
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