In vivo microdialysis was employed to measure the extracellular concentrations of dopamine (DA) in the medial preoptic area (MPOA) of rats during male sexual activity to look for a correlation with sexual activity. During copulation, the concentration of DA in the MPOA was significantly increased. A significant difference was detected in changes of DA between copulators and non-copulators. These findings were consistent with the assertion that DA neuron activity in the MPOA facilities male copulatory behavior.
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