Men were asked to recall what underwear they prefer rather than actually being observed, and all of the men were seeking fertility treatment - so the findings might be have been different if other men had been involved in the test.
They provided semen and blood samples and answered a questionnaire on their choice of underwear.
Scientists at the Harvard T H Chan School of Public Health tested 656 men and found that those who wore boxers had 25% more sperm per millilitre and 17% in each ejaculate than those that wore briefs, jockeys or smaller trousers.
Photo of overdosing suspect 'worth a thousand words'
A mugshot of Michael Krajczynski, a Rhode Island man who police say overdosed on a suspected opioid with his son in the backseat. A month after that, an IN mom overdosed IN her vehicle while her 10-month-old cried IN the backseat, police told the IndyStar.
The men, who were between the ages of 32 and 39, completed a survey that included questions about the style of underwear they wore in the previous three months.
Commenting on the research, Prof Allan Pacey, Professor of Andrology, University of Sheffield, said: "This study confirms my long-held belief that men with poor sperm quality could potentially improve things by wearing looser underwear and keeping their testicles as cool as possible".
"Men could improve their sperm production by easily changing their type of underwear".
Men who wear tight underwear could increase their chances of having children by switching to looser fitting boxer shorts, scientists are recommending. FSH is a hormone that is known to play a role in male fertility.
Follicle stimulating hormone is associated with sperm production, suggesting, researchers said, that the brain stepped up production of the hormone to compensate for the decreased sperm production in the men wearing tighter underwear.
Here's everything you need to know before you jump back in for more of Overwatch's endlessly arresting PvP skirmishes. The Summer Games was the very first in-game event introduced to Overwatch , originally in honor of the 2016 Olympics.
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When Sony first announced that it was developing a Venom movie, the descriptor "R-rated" immediately followed. Variety notes that Sony's model differs from that of Marvel or DC in that it's more producer-driven.
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Francois Sheriff Daniel Bullock , KMOV-TV reported. "This is the kind of thing that happens somewhere else, and not here". The charges could put the suspects behind bars for decades, prosecuting attorney Jerrod Mahurin said.
Rafael Nadal (ESP) returns a ball to Benoit Paire (not pictured) in the Rogers Cup tennis tournament at Aviva Centre. Teenaged prodigy Shapovalov eliminated Italian 14th seed Fabio Fognini victor last weekend in Los Cabos, 6-3, 7-5.
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Ant McPartlin will not host this year's I'm a Celeb
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Stephen Curry: Donald Trump's LeBron James Tweet Racist
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3 life terms for shooter in Kansas hate crime
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