Premature ejaculation has long been recognized as a health condition, but a clear definition of the condition has emerged only recently, and it is still evolving. Now one group of sexual medicine experts say they've arrived at a new definition that includes men who have had premature ejaculation all their lives, and those who've acquired the condition as they've aged. 
 
 Men with "acquired" premature ejaculation are those who have had normal sexual function in the past, but now nearly always ejaculate less than three minutes after penetration, under the new definition. "Lifelong" premature ejaculation is defined as having sex that lasts for about one minute of vaginal penetration, and has been like that since the first sexual experience. 
 
 The definition also says that men who have premature ejaculation may be suffering from the negative personal consequences of being unable to delay ejaculation, such as distress, frustration or an avoidance of sexual intimacy, the researchers said. [7 Surprising Reasons for Erectile Dysfunction] 
 
 To write the new definition, experts in the International Society for Sexual Medicine (ISSM) reviewed the scientific evidence on the forms of premature ejaculation, as well as recommended treatments. The experts authored two reports published today (May 22) in the Journal of Sexual Medicine. 
 
 In 2008, the ISSM experts issued an earlier definition for lifelong premature ejaculation but this was limited to men with the lifelong form of the disorder. 
 
 "The unified definition of lifelong and acquired premature ejaculation will reduce errors of diagnosis and classification by providing the clinician with a discriminating diagnostic tool," said study researcher Dr. Ege Can Serefoglu, of the Bagcilar Training & Research Hospital, in Istanbul, Turkey. 
 
 Doctors can use the new definition to diagnosis men with the condition, and to design clinical trials for treatments, the researchers said. 
 
 However, the researchers limited their definition to men engaging in vaginal intercourse because there are few studies on early ejaculation in the context of other sexual acts or in homosexual men, the researchers said. 
 
 Acquired premature ejaculation is most commonly due to sexual performance anxiety, psychological or relationship problems, or erectile dysfunction, the researchers said. But it can also be due to inflammation of the prostate gland, an overactive thyroid or withdrawal from prescribed or recreational drugs. 
 
 As many as one-third of men may suffer from premature ejaculation at some point in their lives, previous studies have found. Reviewing past data, the researchers found that about 2 to 3 percent of men have lifelong premature ejaculation, and the rate of acquired premature ejaculation is about 4 percent among sexually active men. 
 
 Email Bahar Gholipour or follow her @alterwired. Follow us @LiveScience, Facebook & Google+. Original article on Live Science. ||||| After childbirth, both parents have changes in their sexual desires, a new study finds. 
 
 While drugs that help men achieve erections have been around for more than a decade, drugs that help men with premature ejaculation are just starting to hit the market. 
 
 One drug, called Promescent, is a spray that contains the anesthetic lidocaine, which reduces sensitivity by numbing the skin, to "allow for longer performance," according to NBC News. The drug is absorbed quickly, so it doens't transfer to the man's partner. It is available over-the-counter. 
 
 Another spray-on drug, called Tempe, uses the anesthetic prilocaine, and is coming to market in Europe, NBC says. 
 
 As many as one third of men may have premature ejaculation at some point in their lives, according to the Mayo Clinic. On average, men take four minutes to ejaculate, but men with premature ejaculation often climax after less than a minute. 
 
 Some men who don't have premature ejaculation report using the sprays to prolong performance, NBC News says. 
 
 "There is a tremendous recreational component," Jeff Abraham, CEO of Absorption Pharmaceuticals, which makes Promescent, was quoted as saying.
– We all know what premature ejaculation is, but it turns out that until now, an agreed-upon definition of the health condition hasn't exactly existed. A committee of sexual medicine experts has changed that, formulating a new definition that for the first time speaks both to men who have experienced the condition all their lives and those who acquired it with age. In the case of the former, it's defined as men whose sexual experiences have always lasted no more than about a minute after penetration; in the case of the latter, it refers to men who almost always reach climax in fewer than three minutes of penetration. (LiveScience last year noted that men in general ejaculate in an average of four minutes.) Further, the definition notes two other components of the sexual dysfunction: an inability to delay ejaculation, and resulting "negative personal consequences." Their paper, published in the Journal of Sexual Medicine, notes that it's the "first evidence-based definition for these conditions," one born from a review of scientific evidence and suggested treatments. This unified definition "will reduce errors of diagnosis and classification," a researcher tells LiveScience, which notes that, because of the nature of the studies the researchers relied on, the definition extends only to men who have heterosexual sex. (A new book argues that short sex is pretty normal.)