The length of time they stay alive has a lot to do with environmental factors and how fast they dry up. If you ovulate shortly after you finish your period, the sperm may still be alive and can fertilize the egg. Learn more: Can you get pregnant if you have sex on your period? Keep reading to learn more about the lifespan of sperm as well as sperm motility.
Sperm: 15 crazy things you should know
Biological Steps to Becoming Pregnant | SexInfo Online
Suarez, A. At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix. In the uterus, muscular contractions may enhance passage of sperm through the uterine cavity.
Sometimes babies come along at inopportune times - after sex, the human body can only delay fertilization for 3 to 5 days. But what if each woman had her own personal sperm bank? What if she could hold on to sperm until she felt ready to get pregnant? Researchers have found many females in the natural world possess the nifty ability to store sperm within their bodies for weeks and even years. In the past decade, scientists have discovered that female birds, reptiles, insects, and even whale sharks use this uncanny reproductive method.