Have your own March Madness in bed. Men produce the healthiest, most potent sperm this time of year, finds a new Israeli study.
Why the seasonal link? “It’s most likely an effect of the temperature,” says Darius A. Paduch, M.D., Ph.D., of Weill Cornell Medical College, who wasn’t involved with the study. Cooler environmental temperatures may play a role in keeping sperm alive and well, Dr. Paduch says. Sperm grow at 95 to 97 degrees Fahrenheit (just below body temperature), and higher temperatures can block production. Since it takes around 70 days to produce a mature sperm cell, the healthy semen sampled in the winter started growing in mid-to-late fall.
So, be aware: Your sperm is likely swimming like Michael Phelps right now—if you’re in a relationship and trying to have kids, it’s time to get busy. (If you’re not, then you need to be very careful.) Of course, don’t leave quality to seasonal factors: Since everything from putting a laptop on your lap to boozing has been suggested to squash your sperm quality, keep your date with the gym today. Researchers at the University of Cordoba found that men who stayed physically active in the past year had better sperm quality and generally higher testosterone levels than sedentary guys.
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