The survival time of sperm outside the body is related to the environment. In a suitable environment, sperm can survive for a longer period of time outside the body as well. If the sperm are exposed to ordinary air after being expelled from the body, they may become inactive or less viable in about 15-30 minutes. If the sperm is kept in a laboratory thermostat at 37°C, it can survive for 2-4 hours with a certain level of viability. However, if in a dry, hot and harsh environment, the sperm survival time will be relatively reduced. In general, sperm preservation requires placing in liquid nitrogen and fast freezing, so that the sperm does not die and can still be revived after thawing for long-term preservation. In the same case, if a man’s sperm survival rate outside the body is too low, it is likely to cause male infertility due to low sperm viability, and it is recommended to go to a regular hospital reproductive center for further examination and then take further treatment.