If you wear boxer shorts, your sperm will pack more of a punch.
That’s the gist of a new Harvard study published in the journal Human Reproduction Wednesday that found that men who wear loose-fitting undies have a higher sperm count and better swimmers than those in tighty-whiteys.
The study probed the potency of 656 men between 32 and 39 and found that guys who sported boxer shorts had a 25-percent higher concentration of sperm and 17-percent higher sperm count totals.
Plus, their boys tended to be more “motile” — that is, capable of swimming through the female reproductive system and actually crossing the proverbial finish line, researchers said.
It’s no secret that heat in a fella’s nether regions reduces his potency, and tighty-whiteys tend to run hotter — but past studies comparing different underwear styles’ effects on sperm production were “inconsistent,” researchers noted.
Study participants were asked whether they wore boxers, jockeys, bikini, briefs or “other.”
The biggest difference in sperm concentration between men wearing boxers and men wearing snugger jockeys and briefs, researchers said.
Guys with tighter-fitting trousers also had higher levels of a hormone that encourages sperm production — likely to compensate for all the seed that gets fried in their high-temperature unmentionables, researchers said.
“Beyond providing additional evidence that underwear choices may impact fertility, our study provides evidence, for the first time, that a seemingly random lifestyle choice could have profound impacts on hormone production in men at both the level of the testis and the brain,” said study senior author Jorge Chavarro.
The new findings add to a growing body of knowledge on the subject.
A 2015 Stanford University study found that men who wear boxers during the day and sleep in the buff at night had 25 percent lower rates of damaged DNA in their sperm compared to those who wear tighty-whities day and night.
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