The first ejaculation and the second ejaculation usually refer to male ejaculation, and the difference between the two ejaculations is the quality and quantity of sperm. The quality and quantity of sperm may differ depending on the time between ejaculations. If the interval between two ejaculations is short, the sperm growth and development environment is basically the same, and there is generally no significant difference in quality, except that the number of sperm in the second ejaculation may decrease; if the interval between two ejaculations is longer, the sperm growth and development environment may be different, and its quality and quantity may also be different. Men should avoid frequent ejaculation within a short period of time, so as not to affect the quality and quantity of sperm, which in turn affects the chances of conception. They should maintain balanced nutrition and sufficient sleep; exercise properly to enhance physical fitness; and prohibit smoking and limit alcohol. If men have sperm quality problems, it is recommended to go to a regular hospital, under the guidance of the doctor, to identify the causes and target treatment.