Premature ejaculation is a common sexual disorder. Estimates vary, but some experts think it affects as many as one out of three men. Even though it's a common problem that can be treated, many men feel embarrassed to talk to their doctors about it or seek treatment.

This problem is very rarely a physical problem. Guilt, anxiety, fear, excitement, and other emotions can contribute. Infrequent sex also affects control. Even a man with normally good control may reach orgasm quickly after a long period of time without sex. Premature ejaculation is also common the first few times a man has sex with a new partner. Men with good ejaculatory control can enjoy sustained levels of sexual arousal before choosing to ejaculate. A man without this control tends to go from zero excitement to orgasm without leveling off.

There's no medical standard for how long it should take a man to ejaculate. The primary sign of premature ejaculation is ejaculation that occurs before both partners wish in the majority of sexual encounters, causing concern or distress. The problem may occur in all sexual situations, including during masturbation — or it may only occur during sexual encounters with another person.

Most men experience premature ejaculation at least once in their lives. Often adolescents and young men experience premature ejaculation during their first sexual encounters, but eventually learn ejaculatory control. Because there is great variability in both how long it takes men to ejaculate and how long both partners want sex to last, researchers have begun to form a quantitative definition of premature ejaculation. Current evidence supports an average intravaginal ejaculation latency time (IELT) of six and a half minutes in 18-30 year olds.

Masters and Johnson stated that a man suffers from premature ejaculation if he ejaculates before his sex partner achieves orgasm in more than fifty percent of their sexual encounters. Other sex researchers have defined premature ejaculation as occurring if the man ejaculates within two minutes of penetration; however, a survey by Alfred Kinsey in the 1950s demonstrated that three quarters of men ejaculate within two minutes of penetration in over half of their sexual encounters. Today, most sex therapists understand premature ejaculation as occurring when a lack of ejaculatory control interferes with sexual or emotional well-being in one or both partners.

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