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 in a bath or spa or sauna. So my question is, can something like a hot bath or a day at the spa decrease a man's fertility?


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

Elevated temperatures are thought to decrease sperm counts in males.







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


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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