Premature ejaculation is the ejaculation of the man’s erect penis during sexual intercourse just before penetration of the vagina or just before the vagina is pumped, followed by penis weakness can not complete sexual intercourse. The ejaculation is the ejaculation occurs during the duration of sexual intercourse, but the duration of sexual intercourse is short, and the wife with normal sexual function does not reach orgasm in at least 50% of the chances of sexual intercourse. Therefore, premature ejaculation and rapid ejaculation are not the same thing. However, there is no significant difference in treatment between the two, and there is no need to subdivide them clinically. Premature ejaculation and rapid ejaculation are often equated in clinical practice. However, strictly speaking, there is a difference between the two. In recent years, most foreign sexologists have tended to refer to the multiple manifestations of premature ejaculation collectively as premature ejaculation disorder. The range includes premature ejaculation, inability to reach the satisfaction of the other party and ejaculate, and inability to effectively control the urge to ejaculate. In this way, there is no need to make a strict distinction between the two. From the beginning of sexual intercourse to the emergence of the problem of fast or slow ejaculation time, the speed of ejaculation varies from person to person each time they have intercourse. Generally the first sexual intercourse, or the first sexual intercourse of the couple after a long time, because the man is too excited, the woman can also quickly enter the orgasm, in this case ejaculation faster, this is a normal phenomenon, after several consecutive sexual intercourse, ejaculation time will be delayed.