Posted by Abby Kapoor on March 05, 2007

Who will not go for a hot relaxing bath after a day long work or before heading for a romantic dinner? Yes, everybody would but now man has to think twice before heading for a hot bath because a new Brazilian study has found that men who go for regular hot bath or Jacuzzi can hurt their male fertility.

The three year long pilot study was performed on eleven infertile men who were exposed to hot shower, Jacuzzis or hot tubs for 30 minutes or for more than three months.

Paul J. Turek, MD, lead investigator and a professor in the UCSF Department of Urology and director of the UCSF Male Reproductive Health Center said, "It has been believed for decades that wet heat exposure is bad for fertility, as an old wives’ tale, but this effect has rarely been documented."

He added, "We now have actual evidence to show patients that these recreational activities are a real risk factor for male infertility."

When the males were made to stop taking hot baths or showers it was seen that the quantity and quality of sperm both increased in 5 out of the 11 men. And, after a period of three to six months it was found that the average active sperm count had increased to almost fivefold.

The sperm mobility, a measure of sperms ability to swim also increased from 12% (at the start of the study) to 34% (at the end of the study). It was found that the remaining six subjects who didn’t accounted for increase in sperm count or mobility was due to the smoking factor either they were chronic smoker or had a history of smoking behind them.
Three of the men who did showed increase in sperm count were occasional smokers.

Turek said though this was only a pilot study but still "these activities can be comfortably added to that list of lifestyle recommendations and ‘things to avoid’ as men attempt to conceive."

The findings were published in the March-April 2007 issue of ‘International Braz J Urol,’ the official journal of the Brazilian Society of Urology. The study findings can be available online at

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