Importantly, while those differences were significant, none of the men had clinically low sperm counts - so while wearing looser boxers might be better for your sperm count, going for tighter ones wouldn't necessarily make you infertile.
According to new research led by Harvard T.H. Chan School of Public Health, men who most frequently wore boxers had significantly higher sperm concentrations and total sperm counts when compared with men who did not usually wear boxers.
"We set out to take a deep, broad look at the effect of self-reported underwear choice on sperm", he said.
In the end, the researchers tested the sperm quality by counting the total number of sperm in the samples and their concentration in the seminal fluid and the concentration of the enzymes responsible for sparsogenes. FSH is a hormone that is known to play a role in male fertility. It adds to evidence that temperature is vital to sperm production.
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"We know that spermatogenesis is very, very sensitive to temperature", Chavarro said.
The groundbreaking study is the largest of its kind to look into the truth of a long-held suspicion that tighter trousers such as Y-fronts or briefs affect a man's ability to father children. In 1998, a small study consisting of 97 men was published in the Journal of Urology, where the authors claimed that the hyperthermic effect of brief style underwear had been exaggerated, and concluded that routinely advising infertility patients to wear boxer shorts was not justified. The men, all between the ages of 32 and 39, had also completed a survey that included questions about the style of underwear they had been wearing for the previous three months.
Study participants were asked whether they wore boxers, jockeys, bikini, briefs or "other".
Sperms gets damaged by a tight fitting underwear.
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Oi, you, in the tight trousers. For instance, their body mass index, whether they are smokers or not, how much time do they spend in sitting down on a daily basis, or if they enjoyed hot baths or not.
The study found underwear choice could actually be a "key regulator" of sexual development and reproduction.
A new United States study has found that men who wear loose-fitting boxers have a significantly higher sperm count than those who wear other types of underwear.
Regardless, if you're trying to fall pregnant, it might be worthwhile heading out to your local Kmart and picking up some boxers for your man.
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Guys with tighter-fitting pants 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.