Premature ejaculation is one of the more common clinical sexual dysfunctions. It is very difficult to give an accurate definition of premature ejaculation, and there are different opinions. Kaplan considers it normal to have the ability to maintain ejaculation for more than 5 minutes after penetration, or for both partners to agree that they are having good intercourse without their efforts to delay ejaculation being compromised. However, it has been reported that 75% of men ejaculate at 2 minutes to 6 minutes of penetration or less is normal. Clinically, it is easy to diagnose premature ejaculation when the penis is erect and ejaculates before entering the vagina, but it is difficult to determine how long it takes to enter the vagina for intercourse. It is generally believed that premature ejaculation is when a man ejaculates after his penis is erect, before it enters the vagina, or just before it enters or just before it is pumped, and the penis naturally weakens and enters a non-responsive period. The time from the start of sexual intercourse to ejaculation varies with age and physique, and is slightly longer when you are young, shorter after your prime, and longer when you have more experience in sexual life. There are various reasons for premature ejaculation, but the first time a couple has sex on their wedding night, the mood is exciting, the nerves are highly excited, the groom may ejaculate just when he touches the sexual organs or the penis is just put into the vagina, and the couple is reunited for a long time, the sexual excitement is faster, the man ejaculates earlier, these cases cannot be diagnosed as premature ejaculation. With the couple living together, it will gradually become normal and no treatment is necessary.