Although the exact definition of premature ejaculation is still controversial, it is generally accepted that premature ejaculation has the following three elements: 1) short intra-vaginal ejaculation latency 2) inability to control and delay one’s ejaculation 3) negative emotions such as worry, frustration, and reduced sexual satisfaction. The determination of premature ejaculation is based on the above three elements (time, control, and pain), of which the second element -Control is particularly important. The first factor in determining premature ejaculation, intravaginal ejaculation latency, which refers to the time interval between penile insertion into the vagina and ejaculation, can be measured with a stopwatch or self-estimated. Because stopwatch measurement is practically difficult to operate, self-estimation is mostly used in clinical practice. However, studies have found that about 38% of patients self-estimate longer than the stopwatch measurement, while only 14% actually underestimate themselves. To improve the accuracy of self-estimation, one can estimate the number of times the penis is pumped in the vagina. There are also some tips that can be used to increase the accuracy of your estimate, such as specific lengths of music, radio broadcasts, or even “sex videos” for those who like to make their own accurate measurements afterwards. Recent studies in five countries, including the United Kingdom and the United States, have reported that the median time of intravaginal ejaculation latency is 5.4 minutes. In contrast, 80-90% of men with lifelong premature ejaculation have an ejaculation latency of less than 1 minute, and 10-20% have a latency of between 1-2 minutes. The second and third elements of determining premature ejaculation are subjective assessments that can be accomplished with psychological examination tools. The most commonly used clinical questionnaire to assess the second element of premature ejaculation – ejaculatory control – is the Premature Ejaculation Diagnostic Tool, which has short questions and is easy to use, making it a practical and valid diagnostic tool for patients suspected of having premature ejaculation. If you score ≥11 it suggests the presence of premature ejaculation, a score of 9 or 10 considers the possible presence of premature ejaculation, and ≤8 no premature ejaculation exists. If you have problems with premature ejaculation, you can first assess yourself using the PDET scale and then ask a male or urological specialist to help analyze it. The third element of assessment-negative and negative emotions is also the result of subjective patient assessment, most often using questionnaires such as the Premature Ejaculation Short Form, which can evaluate the degree of impact of premature ejaculation on sexual satisfaction. With these three elements, in a few minutes, you yourself can make a preliminary determination of the presence or absence of premature ejaculation. If you have any problems or disturbances in this area, you can visit a male or urologist to further clarify the diagnosis through detailed medical history, sexual life and examination of possible pathogenic factors by a specialist.