** Extrinsic stimuli are called '''erotogenic stimuli'''.
** Extrinsic stimuli are called '''erotogenic stimuli'''.
* Stimuli cause afferent sensory nerves to fire.
* Stimuli cause afferent sensory nerves to fire.
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* Terminals synapse with neurons in the ''''behaviour centre'''' in the hypothalamus.
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* Terminals synapse with neurons in the ''''behaviour centre'''' in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|Hypothalamus]].