: Does a hot bath effect fertility in men? I was taught that a man's testes are outside his body because sperm can't handle inside-body temperature. I was thinking there are other times where a man's testes heat up. Like

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From "Can Male Fertility Be Improved Prior to Assisted Reproduction through The Control of Uncommonly Considered Factors?" (2013):

Hot baths
Jung and Schuppe (26) reviewed the evidence on scrotal temperature and fertility. Studies that addressed professional exposure to high temperatures delivered conflicting results concerning fertility parameters. However, contraception via genital heat stress has been demonstrated using hot sitting baths or insulating suspensors. In a small study, wet heat exposure was a potentially reversible cause of low semen quality in infertile men, and scrotal cooling was found efficient in improving semen quality (27).

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Closely Related to: What is the latest evidence on underwear affecting sperm count?

Elevated temperatures are thought to decrease sperm counts in males.

Mayoclinic.org

Elevated temperatures impair sperm production and function. Although
studies are limited and are inconclusive, frequent use of saunas or
hot tubs may temporarily impair your sperm count.

Sitting for long periods, wearing tight clothing or working on a
laptop computer for long stretches of time also may increase the
temperature in your scrotum and may slightly reduce sperm production.

And

WebMD.com

Keep your scrotum cool, because heat slows down the making of sperm.
To do this, avoid hot baths, wear boxers instead of briefs, and try
not to wear tight pants.

And

parentingweekly.com

Researchers have found that the reason why a man's testicles rest
outside the body in the scrotum rather than in the abdomen like the
ovaries is because the ideal temperature for sperm production is three
to four degrees below normal body temperature. Any warmer will affect
sperm count, slashing it by about 40 percent per one-degree rise.
Temporary overheating of the testicles can result from exposure to
things such as saunas, hot tubs, heating blankets, even waterbeds.

So opinions vary on the accountability of research, but are consistent with heat having a possible risk.