Blokes who wear boxer shorts are more likely to become dads, study reveals
They produce more sperm than those who wear Y-fronts, briefs, or jockeys – and of a better quality.
Experts say testicles function best at cooler temperatures and get too hot in most underwear.
They suggest fellas make the “relatively easy” switch to boxers if they are trying for a baby.
Medics from Harvard TH Chan School of Public Health, in the US, analysed samples from 656 blokes.
They were aged between 18 and 56 and had an average BMI of 26 – mildly overweight.
Just over half – 53 per cent – typically wore boxer shorts.
They had 25 per cent higher sperm concentrations than those wearing other underwear.
And they had a 17 per cent higher total sperm counts and 33 per cent more strong swimmers.
Their sperm were also more likely to be correctly shaped.
The most notable difference was between men who wore boxers and those who wore briefs.
Study leader Dr Lidia Mingeuz-Alarcon said: “These results point to a relatively easy change that men can make when they and their partners are seeking to become pregnant.”
The study, published in the journal Human Reproduction, is the largest ever into the effects of underwear on sperm.
Commenting on the findings, Prof Richard Sharpe, from the University of Edinburgh, said: “Successful sperm production requires a temperature 3 to 4C below core body temperature.
“This is achieved via a specialised blood cooling system and placement of the testes outside of the body in the scrotum.
“It is well established that anything that interferes with maintenance of testes cooling is likely to impair sperm production and quality.
“But the extent to which type of underwear worn might cause such interference has been a subject of debate for many years.
“Wearing looser underwear and avoiding other sources of scrotal heating, such as hot baths and saunas, are easy adjustments for a man to take that might have a positive effect on his sperm.
“This may increase the chances of achieving a pregnancy – although pregnancy success was not measured in this study.”
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