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Male fertility is constantly decreasing. Live sperm production in European men has decreased by 50 percent in the last 30 years, and the density lessens by two to four per cent each year. However, this is not merely a European phenomenon.

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In the Middle Ages, men who wanted sons would sometimes have their left testicle chopped off because they thought the right testicle made male sperm, and the left made female. And, in Roman times, men placed their right hand on their balls before giving testimony in court, the reason being having testicles supposedly made them whole as opposed to women and eunuchs who were not allowed to testify. The testicles make million sperm every day.

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Please refresh the page and retry. G ood news, fans of sleeping in the nude: there is an excuse to air yourself at night-time. Tight boxers are the biggest offenders here - they increase the temperature of the testicles, which can cause the quality of a man's sperm to decrease.

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A vasectomy is a procedure that makes a man permanently unable to get a woman pregnant. It involves cutting or blocking two tubes, called the vas deferens, so that sperm can no longer get into the semen. Vasectomy may be the safest, most effective kind of birth control. Only about 1 or 2 out of 1, couples get pregnant the first year after a vasectomy.

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Boys give little thought to muscles and beards when they are young. However, between the ages of 9 and 16, most boys will experience puberty. It will be a time of change, both physically and emotionally.

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In the s the biologist Ronald Ericsson came up with a way to separate sperm carrying the male-producing Y chromosome from those carrying the X. He sent the two kinds of sperm swimming down a glass tube through ever-thicker albumin barriers. The sperm with the X chromosome had a larger head and a longer tail, and so, he figured, they would get bogged down in the viscous liquid.

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The naked mole rat must be one of the strangest mammals in existence. They live in underground colonies like those of ants and bees, with a fertile queen lording over sterile workers. They feel no pain in their skin, they live unusually long lives, they can cope with chokingly low levels of oxygen, and they seem to be immune to cancer.

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Skip to Content. Many cancer treatments affect fertility temporarily or permanently. Fertility is the ability to father a child. Infertility is the inability to father a child.

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Started by thedoc Board Question of the Week. Science News Features. Interviews Answers to Science Questions.

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On her bizarre beverage concoction, Tracy said: "I'd been feeling run down and had no energy, but now I'm full of beans and my mood has improved. My other mates think I'm strange, but I don't give a toss. Tracy, who is a vegan, roped her single pal into giving her his semen.

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