There is some variation in the survival time of sperm on the skin. Semen is composed of two parts: sperm and seminal plasma. The main components of seminal plasma, including prostatic fluid, seminal vesicle gland fluid, and secretion from the urethral bulb gland, mainly serve as protection and nutrition for sperm. After the semen is discharged from the body, it can survive on the surface of human skin for about 4-8 hours at 37°C. However, if the surrounding environment is at a lower temperature, the survival time will be longer, possibly reaching about 5-10 hours, but if the semen is on a dry skin surface, the seminal plasma in the semen dries out, the sperm loses nutrition and protection, and the survival time is usually only a few minutes. From the above, we can see that if in a dry environment, the survival time of sperm should be relatively short, but if the environment is suitable will survive for a longer period of time.