Conception and sperm life

It takes two to make a baby. Although a woman will carry and deliver the child, a man also has a crucial role in pregnancy. For fertilization to occur, his sperm must be healthy and strong to reach and penetrate the woman's egg. A problem in any step in this process can prevent pregnancy.

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The first fraction of ejaculate is the most effective for conception

Egg, Meet Sperm: The Stubborn Secrets of Sex and Conception

While you release only a single egg each month, your partner releases millions of sperm in a single ejaculation — all with their eye on that single prize. But only one of those sperm will be crowned the victor, and the odds are stacked against fertilization. Luckily, egg and sperm have developed some pretty nifty tricks to give themselves a fighting chance. Fortify the troops. The liquid portion of semen not only provides the sperm with nourishment for the journey, it actually coagulates in a woman's vagina after ejaculation, forming a physical barrier that prevents the sperm from wandering very far in the wrong direction. This protection disappears within half an hour, when the semen reliquefies. Any sperm that hasn't made it up through the cervix by then is clearly not worth saving, and those left behind for more than a few moments doesn't have much of a chance anyway; the vagina is an acidic place to hang out and quickly destroys any errant cells that's why sperm dribbles out of you after you have sex.
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The macho sperm myth

Every month, the reproductive organs in a healthy woman prepare for pregnancy. After ovulation the egg lives for 12 to 24 hours and must be fertilised in that time if a woman is to become pregnant. The burst of oestrogen just before ovulation also works inside the neck of the uterus the cervix to make protein-rich clear jelly that covers the top of the vagina during sex. This makes the vagina acidic which prevents thrush and other infections. This is also a suitable environment for sperm survival.
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Becoming pregnant might seem easy for a lot of women, but for others it's not so simple. Everything from diet to niggling little health problems could be causing problems. But there are a number of things you can look at to help boost your chances. Almost one-in-six couples experience problems with fertility - and age is one of the biggest factors.
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