How Sperm ‘Swim’ May Be Nothing But an Optical Illusion

An international group of scientists say their latest research will upturn one of the earliest scientific discoveries ever made about human sperm. In a new paper published on Friday, they seem to show that sperm cells don’t propel themselves by simply flicking their tails back and forth, as is commonly believed. Rather, sperm perform a complex routine of three-dimensional rolling and spinning motions that only make them look like they’re lashing their tails when viewed through a typical microscope. Read More >>

Want to Keep Your Sperm Healthy? Stick to Boxers, Says Harvard Study

It’s long been thought that snug underwear can be bad for men’s semen quality, thanks to the warmer temperatures they can cause down below. And a new study out of Harvard University seems to confirm that suspicion. It found that men attending a fertility centre who regularly wore boxers had higher sperm counts and healthier sperm than everyone else. Read More >>

This Star Wars-Inspired Simulation of Human Reproduction Is Awesome

The microscopic processes involved in human fertilization are a difficult thing to convey visually, but a group of scientists, using Star Wars as their inspiration, have managed to do just that, creating a highly entertaining and informative video—while accidentally stumbling upon a new scientific discovery in the process. Read More >>

Sperm Counts Have Plummeted Among Western Men, Scientists Confirm

Something weird is going on with human sperm production. For decades, scientists have warned that sperm counts are dropping among Western men, but no one has really been able to prove it. In what is now the largest and most comprehensive study of its kind, scientists have presented compelling evidence in support of this rather alarming assertion, showing that sperm counts have dropped more than 50 percent in just four decades. Read More >>

Scientists Found a Good Use for Surplus Sperm

A team of German scientists were wondering how to deliver medications into the female reproductive tract and realised, hey, why come up with something new? The human body already produces its own little machines perfectly suited to deliver their goods to that same spot. So, why not tame our little sex swimmers as a means of treating disease — by strapping little hats onto them? Read More >>

New Reversible Male Contraceptive Has Just the One Massive Flaw

Scientists are preparing a new form of male contraceptive, which is nice, and it's reversible, which is also nice. The only problem being that it involves an injection right into the testicles. It's going to be hard to write about this in a gender neutral manner. Read More >>

At-Home Fertility Test Turns Your Smartphone Into World’s Squirmiest Sea-Monkey Tank

It’s one thing to hear about Michael Phelps winning a gold medal. It’s quite another to actually see him do it. Read More >>

YO Sperm Test Lets You Analyse Your Baby Gravy on a Smartphone

Before you get straight to business and hose your handset down, we need to clarify that this requires a clip-on microscope and an app. You don’t want to be cleaning the sticky stuff off your screen, and don’t even get me started on the ports. Read More >>

Scientists Have Bred Live Mice with No Need for Fertilised Eggs

For the first time ever, scientists have produced live mice without a fertilised egg cell. The potentially revolutionary technique could one day allow gay men to produce biological offspring, or—even more radically—allow both men and women to self-fertilise. Read More >>

Greg Rutherford Freezes Sperm Due to Rio Olympics Zika Virus Fears

Rio 2016 is going to be fascinating for all the wrong reasons. British athlete Greg Rutherford -- you know, the one everyone swears is a dead ringer for Neil Patrick Harris -- has decided to have his sperm frozen ahead of this year’s Olympic Games because of the Zika virus. Read More >>

Why Do Tiny Fruit Flies Have Giant Sperm?

Fruit flies have enormous sperm. This is a well known fact in the scientific community — so well known, in fact, that there’s a name for it: the big sperm paradox. But the massive, spermy problem has long confounded scientists, who couldn’t figure out why such a tiny creature needed such humongous baby batter soldiers. Until now. Read More >>

This On-Off Switch for Sperm Could Lead to Better Male Birth Control

Researchers have found an on-off switch for sperm movement. This has the potential to help men who are infertile, but it also has the potential to help all men, as it could be an effective form of male birth control. Read More >>

Scientists Have Created Functional Sperm From Stem Cells

Scientists from China have made history by taking a cell that’s not a sperm cell and then used it to create a live animal. A similar technique could be used one day to treat infertility in humans. Read More >>

This Condom Alternative Pumps Your Ejaculate Straight Back Into Your Scrotum

It's 2016, and male contraception still ultimately boils down to condoms and vasectomies. Lack of pleasure and surgery. Let’s face it, they’re not exactly terrific options. Researchers are experimenting with pills and injections, but it’s likely to be a while before safe substances are made commercially available. Read More >>

Scientists Can Now Make Fake Sperm Swim 

What you’re seeing in this video is obviously a sperm cell, except it was made in a lab, not a testicle. It’s designed to show how passive elastic swimming can mimic, fairly well, the motions that allow sperm (or fish) to swim. Read More >>