Sperm count drop 'could make humans extinct'By Pallab GhoshScience correspondent, BBC
Are you between the ages of 10 and 25, and do you have swelling under and/or around one or both nipples?
Humans could become extinct if sperm counts in men continue to fall at current rates, a doctor has warned.
Researchers assessing the results of nearly 200 studies say sperm counts among men from North America, Europe, Australia, and New Zealand, seem to have halved in less than 40 years.
Some experts are sceptical of the Human Reproduction Update findings.
But lead researcher Dr Hagai Levine said he was "very worried" about what might happen in the future.
The assessment, one of the largest ever undertaken, brings together the results of 185 studies between 1973 and 2011.
Dr Levine, an epidemiologist, told the BBC that if the trend continued humans would become extinct.
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High Blood Pressure in African-Americans
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Erectile dysfunction, or ED, is when it is hard to get or keep an erection that's firm enough for sex. ED affects as many as 30 million men.
Most men have problems with erections from time to time. But when this happens more than half of the time, then ED is present. ED can happen when health problems limit blood flow or damage nerves in the penis. ED can also be caused by stress or emotional reasons. ED can be an early warning of a more serious illness. Heart disease, high blood pressure and high blood sugar can all cause ED. Finding and treating the cause(s) of your ED can help your overall health and well-being.
How Erections Work
When you are not sexually aroused, your penis is soft and limp. During sexual arousal, nerve messages release chemicals that increase blood flow into the penis. The blood flows into 2 erection chambers made of spongy tissue (the corpus cavernosum) in the penis. The "smooth muscle" in the erection chambers relaxes, which lets blood enter and stay in the chambers. The pressure of the blood in the chambers makes the penis firm, giving you an erection. After you have an orgasm, the blood flows out of the chambers and the erection goes away.
What are the Symptoms of ED?
When you have ED, it is hard to get or keep an erection that is firm enough for sex. Most men have trouble with erections from time to time, but in some men it is a regular and more bothersome problem. ED can cause:
ED may affect the quality of a marriage or intimate relationships.
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