Healthy sex is a very important part of your loving relationship, and your concern about all aspects is genuine.
By definition, premature ejaculation is when occurs in less than one minute of vaginal penetration or inability to delay ejaculation after vaginal penetration and is accompanied by negative personal experiences such as frustration, distress, or avoidance of sexual intimacy.
The duration may vary from person to person. It also depends on several other factors. If you are psychologically stressed or depressed, it might affect your ability to enjoy healthy sexual intercourse.
Pharmacological studies revealed that it is due to decreased serotonin neurotransmission at nerve pathways that control ejaculation.