Human testes hang outside the body because sperm production requires a temperature about two degrees Celsius below core body temperature.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

1 source for · 0 against

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Is it true that human testes hang outside the body because sperm production requires a temperature about two degrees Celsius below core body temperature?

Yes. A Cleveland Clinic reference page states that the testicles sit about 3 degrees Celsius (5 degrees Fahrenheit) below body temperature and that this cooler temperature is better for making sperm, which supports the claim that the external scrotal position serves sperm production's temperature requirement.

Verdict: SUPPORTED · 1 source for, 0 against · Last checked 2 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 1

Testicles (Testes): Location, Anatomy, Function & Conditions

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Testicles (Testes): Location, Anatomy, Function & Conditions. (n.d.). my.clevelandclinic.org. https://my.clevelandclinic.org/health/body/23964-testicles

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