An international group of specialists now define how quick is too quick when it comes to men's ejaculation - three minutes or less is premature ejaculation (PE).

According to the definition of the International Society for Sexual Medicine ISSM, PE or premature ejaculation occurs when a man ejaculates before he or his partner want climax to happen.

The occurrence of PE may start during men's very first sexual experience or unfortunately, later after a period of normal satisfying ejaculation.

PE poses as a threat to the relationship of partners as men with this condition feel insecure, embarrassed, anxious and depressed, according to ISSM.

Sadly for the single men, they tend to avoid having relationships because of PE.

PE was first documented more than 100 years ago, the Sydney Morning Herald reports. However, unclear definitions and vague 'time frame' still confuses men that some believed they have the condition even if they do not.

Sydney sexual health doctor and the director of the Australian Centre for Sexual Health, Chris McMahon, said that a significant number of men will say "yes" right away when asked if they think they ejaculate too quickly.

According to McMahon, aside from the three-minute timing, signs of PE include being inability to control the ejaculation or to delay it.

"These men are upset, they're bothered, they're frustrated and they develop a pattern of avoiding sex," he said.

For those men who can go beyond the three-minute rule but sometimes come too soon, they have the condition known as variable premature ejaculation. Those who just think they just come too quickly but in reality do not, the condition is called subjective premature ejaculation.

"What they need is to be educated, they don't need medication. I think in many cases men tend to benchmark their sexual performance against what they see in pornography. That reflects the very poor sex education we still see in our teenagers," he said.

McMahon called for men not to be ashamed when they feel they have problems with their sexual performance. He noted that a lot of men will only seek medical help after their relationships were already strained which was already years after they saw symptoms.

He said that everyone, men and women, should be educated about sexual performance being different among individuals.

"Often all it takes is for [men] to be educated, to be told that their experiences parallel those of other men in their age group," he said.

The detail of Mr McMahon's study is published in The Journal of Sexual Medicine.