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If this happens, it is very important to see a doctor or talk to an adult as soon as possible. The safest and surest way to prevent a pregnancy during sexual intercourse is to use contraception. If you decide to have sex, it is very important to talk together about what you might choose for contraception and then to use it when you have sex.

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Low sperm counts, high percentages of abnormal sperm and poor motility can all decrease the likelihood of successfully fertilizing an egg. If so, this would certainly be a significant scientific breakthrough. That being said, considering how huge this would be, it is suspicious that the work has not been peer-reviewed, or even published at all.

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Back to Sexual health. Puberty can be a confusing time, because your body and your feelings are changing as you grow up. Here are answers to some of the questions that boys often ask about their bodies. Puberty describes all the physical changes that children go through as they grow into adults.

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Whether you're looking to conceive a child with your partner, or are just concerned about your sperm levels, science has published some interesting new research. A Chinese study has found that sperm collected after a man has already ejaculated swims fastest and is considerably more likely to fertilise an egg. Related: Want stronger sperm?

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Sperm gets ejected from the penis, enters the vagina, and swims up the reproductive tract until they reach the egg to fertilize it. Barely years ago, it was considered a major scientific breakthrough when scientists came up with the idea that a fully formed, tiny human inhabited the head of each sperm — totally debunked and untrue. Fortunately, as the human body has evolved over thousands of years to maximize fertility potential, so has our scientific understanding about sperm.

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To become pregnantthe following steps must occur:. Following ejaculation, the semen forms a gel that protects it from the acidic environment of the vagina. The gel is liquefied within 20 to 30 minutes by enzymes from the prostate gland.

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Men are doomed. Everybody knows this. We're obviously all doomed, the women too, everybody in general, just a waiting game until one or another of the stupid things our stupid species is up to finally gets us.

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Grady, pictured at two weeks old, is the first primate born using sperm from a tissue-grafting technique. Credit: OHSU. A one-of-a-kind rhesus macaque named Grady is growing up under intense scrutiny at the Oregon National Primate Research Center in Beaverton.

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Adapting to endure humanity's impact on the world. This is because chemotherapy and radiation treatments often damage the cells which will eventually be responsible for producing sperm. For these young boys, hope for assuring their future fertility lies in preservation of their testicular tissues before treatment.