Q: What is the most probable cause of primary premature ejaculation?  

Answer: C

Primary premature ejaculation refers to the condition where a male experiences ejaculation within one minute of sexual activity consistently and has been doing so since the onset of sexual activity. It is believed that impairment of serotonin pathways and factors affecting dopamine and oxytocin are the primary causes of this condition. Studies have shown that the regulation of ejaculation involves the interaction of several neurotransmitters, including serotonin, dopamine, and oxytocin. When these neurotransmitters are not properly regulated, it can lead to the premature ejaculation. Serotonin is known to have a role in the regulation of ejaculation, and decreased levels of this neurotransmitter have been linked to primary premature ejaculation. Dopamine and oxytocin are also involved in ejaculation, and their impairment has been linked to premature ejaculation.

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