![]() If you smoke, ask your doctor to help you quit. Men who smoke cigarettes are more likely to have low sperm counts. Sperm can be especially vulnerable to environmental factors, such as exposure to excessive heat or toxic chemicals. While not as important a factor as sperm quantity or movement, the more sperm you have with a normal shape and structure, the more likely you are to be fertile. ![]() Normal sperm have oval heads and long tails, which work together to propel them. ![]() You're most likely to be fertile if at least 40% of your sperm are moving. To reach and fertilize an egg, sperm must move - wriggling and swimming through a woman's cervix, uterus and fallopian tubes. Too little sperm in an ejaculation might make it more difficult to get pregnant because there are fewer candidates available to fertilize the egg. You're most likely to be fertile if your ejaculate - the semen discharged in a single ejaculation - contains at least 15 million sperm per milliliter. ![]() Sperm health depends on various factors, including quantity, movement and structure: The penis ejaculates semen during sexual intercourse. Fluid from the seminal vesicles and prostate gland combine with sperm to make semen. The male reproductive system makes, stores and moves sperm.
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