What are the causes of "coming too quickly" in men?
The most frequent cause is sexual insecurity and the fear of doing it wrongly. The fear increases the excitement, and makes the ejaculation take place. Sometimes, coming fast has been learned in childhood by quick masturbation for example. One has learned, as a reflex, to come fast when excited. Insufficient concentration of the neurotransmitter serotonin is now thought to be a physical cause.