Research suggests that prolonged or even short-term high temperatures can affect the size of testicles, sperm quality, and possibly testosterone levels. It is noted that our gonads function optimally at a temperature 2-4°C lower than our core body temperature. To maintain this, the body uses the cremasteric reflex to adjust the position of the testicles relative to the body. Studies indicate that heat may lower testosterone levels, but the evidence is mixed​​​​​​. ['']

According to various studies, heating testicles beyond their normal body temperature can cause significant reduction in sperm count and motility ['']. Many experts will recommend avoiding saunas as a result

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