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A debate has raged for decades over whether male fertility is declining, according to some analyses of studies from recent decades. The latest study of a new at-home test kit, published today in Science Translational Medicine, found that even untrained users were able to measure sperm count and concentration as well as motility the percentage of actively moving spermdetecting abnormal semen with 97 percent accuracy compared with traditional lab testing. Developed by researchers at Harvard Medical School, the system uses a smartphone app with a 3-D—printed optical attachment to record a video of sperm cells in a sample.

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The reason for this relationship between soy and sperm count isn't clear. However, researchers speculate that soy increases estrogen activity, which may have a negative affect on sperm production and also interfere with other hormonal signals. Jorge Chavarro, a research fellow in the department of nutrition at the Harvard School of Public Health.

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For many species, love is truly a battlefield. While the animal kingdom is full of diverse social structures, a pretty common one involves males tussling for access to females. For these males, being—or at least looking—physically powerful tends to be a perk: Rippling muscles can be an advertisement for future security, and a promise of robust, sexually successful offspring.

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Young, fit men whose diets are made up of pizza, burgers, chips and other processed staples have drastically lower sperm counts than those who eat fresher foods, a study suggests. This amounted to an average of This is driving soaring rates of obesity, and related diseases like diabetes and cancer.

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A new sperm separation technique may one day allow prospective parents undergoing IVF to choose whether they have a boy or a girl before fertilisation takes place, researchers say. Scientists in Japan have reported a new method which allows them to separate mouse sperm carrying an X chromosome from those carrying a Y chromosome, meaning that sperm can be selected based on whether they will result in female XX or male XY offspring when used to fertilise an egg. The researchers say they made their discovery as part of a project to unpick and understand the differences between sperm carrying an X chromosome or a Y chromosome, noting that the former carries far more genes than the latter.

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School of Medicine. Sperm may be too few in number, move too slowly, or be structurally abnormal, or their passage out of the body may be blocked or disrupted. Clomiphenea fertility drug, may increase the number of sperm, but assisted reproductive techniques may be needed. See also Overview of Infertility.

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Low sperm count means that the fluid semen you ejaculate during an orgasm contains fewer sperm than normal. A low sperm count is also called oligospermia ol-ih-go-SPUR-me-uh. A complete absence of sperm is called azoospermia.

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