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This first semen volume is small. To map the neuronal activation of the brain during the ejaculatory response, researchers have studied the expression of c-Fos , a proto-oncogene expressed in neurons in response to stimulation by hormones and neurotransmitters. The duration of the refractory period varies considerably, even for a given individual. However, one does not need a fancy survey to recognize the anguish and sensitivity attached to the attached organ that is the human penis. Journal of Sexual Medicine. Large Porn Films Tube Paradigms for the Study of Behavior.

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