sperm

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China's Sperm Seems to Be Getting Worse

56% of would-be donors were a-OK in 2001; in 2015, it was 18%

(Newser) - Researchers set out to evaluate semen quality among young Chinese men over the past 15 years, and the results are fairly staggering: In 2001, the rate of qualified donors to a clinic in Hunan Province stood at 55.8%; in 2015, that was slashed by more than two-thirds to 17.... More »

Zika Virus Ravages Testicles of Male Mice

Just 2 weeks post-infection, their testes shrank visibly

(Newser) - The Zika virus has been linked to microcephaly, or shrunken heads, in the infants of pregnant women who contract the virus, but it also decimates the testicles of males—at least in mice, report researchers in the journal Nature . Little is currently known about the impact of an infection on... More »

New Vision for Male Birth Control: Don't Let Sperm Swim

Control over sperm motility could help infertile men, too

(Newser) - Male fertility comes down to one thing in many cases: sperm motility. If they're not good swimmers, fertility can be an issue, reports the Independent . But researchers at the University of Wolverhampton in the UK are reporting (though not yet in a peer-reviewed scientific journal) that they may have... More »

Guys, Smoking May Damage Your Sperm

When fathers are smokers, odds of fertilization go down and genetic abnormalities go up

(Newser) - Need another reason to keep your distance from cigarettes? For men, smoking appears to damage their sperm and potentially their offspring, too. Reporting in the journal BJU International , researchers say that men who smoke have a higher percentage of damage to sperm DNA; they had partially and sometimes totally inactive... More »

Athletes, Coaches Freezing Sperm Before Olympics Over Zika Fears

But few plan on staying home

(Newser) - The Zika virus is adding a whole new wrinkle to the way athletes and coaches are preparing for the Olympics this year. For example, the New York Times reports John Speraw, coach of the US men's indoor volleyball team, is freezing his sperm before traveling to Rio. “My... More »

Why More People Are Harvesting Dead Men's Sperm

And why US law is confused about it

(Newser) - Ana and Michael Clark were newlyweds on a motorcycle ride in California when tragedy struck: Their bike flew off a cliff, killing Michael and leaving Ana with shoulder and spine fractures. Grieving for her lost husband, Ana was also upset about the children they would never have, so she shipped... More »

Couple's Caffeine Intake Linked to Miscarriage

Multivitamins in the weeks before, after conception also play a role

(Newser) - For all the couples out there trying to do everything just right in the weeks leading up to conception, scientists are now suggesting that not just women but men, too, cap their caffeine consumption at two drinks per day. In other words, healthy sperm are very much a part of... More »

Working Mouse Sperm Created From Stem Cells

Step could someday lead to treatment for infertile men

(Newser) - Scientists have produced rudimentary mouse sperm from stem cells in the laboratory, a step that may lead to a treatment for infertile men. If the technique pans out in people, doctors might someday be able to turn skin cells from a man into sperm that can pass along his DNA... More »

Military Will Start Freezing Soldiers' Eggs and Sperm

It wants them to start families later and not worry about genital injuries

(Newser) - In an effort to keep young military enlistees from leaving to start a family, the Pentagon is going to start offering to freeze their eggs and sperm, the New York Times reports. According to the Military Times , nearly 72% of enlistees are 30 or younger—prime years for starting a... More »

Your Father's Sperm Might Be Making You Fat

Dad's weight when he conceives children may affect them, study says

(Newser) - Having trouble maintaining your ideal weight? Blame your dad's sperm. That may sound odd, but a study published Thursday in Cell Metabolism found that a man's weight may change the information carried in his sperm and predispose his children to obesity, reports the New York Times . Researchers compared... More »

What Women Really Want— at Least in a Sperm Donor

Women tend to go for smart, shy, calm men when choosing biological dad

(Newser) - What women really want in a man could be vastly different depending on the scenario—i.e., lustful attraction at a bar versus calculated decision-making at a sperm bank. So a team of economists at Queensland University of Technology set out to examine sperm donor preferences among women online and... More »

Inside the Sperm 'Factory' That's Supplying the World

27K babies have been born with sperm from Cryos International

(Newser) - Ole Schou is the man in charge of "a kind of factory" where "volume and quality is important" and exports make up 96% of the business. But unlike most factories, his doesn't fabricate anything. At Cryos International, some 1,000 donors are paid $15 to $76 for... More »

At UK's National Sperm Bank, Choose Between 9 Donors

Choices are, um, limited

(Newser) - Fast-forward 18 years and it shouldn't be too hard for children born out of Britain's national sperm bank to identity their biological father. The year-old sperm bank, created to address a major sperm shortage in the UK, has just nine registered donors with the first samples set to... More »

What Marijuana May Do to Sperm

Nothing good...

(Newser) - Smoking pot could damage your semen quality, or so suggests a new study out of Denmark. Some 1,215 Danish men ages 18 to 28 were asked about their drug use over the past three months and provided a semen sample. The researchers found a correlation between men who smoked... More »

Man Sues After Ex Uses His Sperm to Get Pregnant

Layne Hardin says contract stated his sperm would go to another

(Newser) - Layne Hardin says his frozen sperm was always to go to Kathy LeBlanc. The pair had one child together, and in case they wanted a second, Hardin stored his sperm at a Houston fertility clinic in 2002, when the couple were domestic partners, before getting a vasectomy, reports ABC News... More »

Surprise Find in Antarctica: Oldest Animal Sperm

It dates back 50M years, from a worm

(Newser) - They were looking for mammal bones, but scientists exploring an island in the Antarctic instead stumbled across an unexpected milestone—the world's oldest animal sperm. They found it inside a fossilized cocoon made by some type of worm (possibly a crayfish worm) 50 million years ago, reports Nature . It... More »

Bioethicist: Men Should Freeze Sperm at 18

Paternal age having a serious effect on next generation, he says

(Newser) - When men are young and full of ... life, they should freeze some sperm for later use, a British bioethicist argues. Dr. Kevin Smith says the risks associated with older fathers—studies have pointed to higher rates of autism and a range of other mental disorders —are enough of a... More »

Could Pesticides Be Killing Our Sperm?

Fruits, veggies with higher pesticide residue resulted in fewer sperm: researchers

(Newser) - Occupational and environmental exposure to pesticides has already been linked to lower semen quality, according to a new study in the Human Reproduction journal. But scientists from the Harvard TH Chan School of Public Health were curious to conduct what they're calling the first study to examine how sperm... More »

How Tightie Whities Kill Sperm Counts

Laptops, cycling, saunas can also affect sperm for the same reason

(Newser) - Worried about how modern life affects human sperm, both in quantity and quality? You're not alone: Ideas have been circulating that things like underwear, laptops, cycling, and weight kill off or weaken sperm. So Five Thirty-Eight starts off by tackling the tight-underwear issue: A 2012 study looked at five... More »

Older Men Really Do Have Worse Sperm

Quality, volume goes down as men age, study says

(Newser) - Every sperm is sacred, but older ones need even more TLC than previously thought. Although scientists have long theorized that sperm quality drops as men age, a University of Otago review of 90 studies from more than 30 countries confirms there are "consistent age-related declines" in the quantity of... More »

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