The cervical mucus examination done 48 hours after sexual intercourse showed that there were many live healthy sperm, and the situation was the same as that just after sexual intercourse. At present, it is believed that sperm gradually leave the cervical region; Some people after ejaculation immediately entered the uterus, while others waited for a long time in the folds of the cervix, so that sperm could be traced back to the uterus in small groups, which increased the chances of sperm meeting eggs.
The junction of two fallopian tubes and uterus is also the place where sperm stay. Perhaps only a small amount of sperm is allowed to pass through the fallopian tube at a time, which proves once again that it takes a long time for sperm to enter the fallopian tube in batches, which increases the chance of sperm meeting eggs.
In the fallopian tube, sperm can live for 85 hours. There is enough sugar and necessary chemicals in oviduct fluid, which is suitable for sperm survival.
The survival time of sperm depends on the composition of cervical motility fluid and oviduct fluid, which are different in each physiological period. It is possible that at some point, the cervical motility actually hindered the number of sperm. Because the vagina is a strongly acidic environment, most sperm that fail to enter the cervix can only survive for two to six hours.
Therefore, the time that sperm can survive in women varies greatly, ranging from two hours to eight days, depending entirely on the physiological situation of women during ejaculation.