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Have human spermatozoa a thermopreferendum?

The possibility that human spermatozoa have a preferred external thermal environment was investigated. Sperm activity was observed in a thermal gradient zone between 31-42 degrees C. Spermatozoa rapidly left the zone when temperatures exceeded 39 degrees C. Evacuation was slower and less complete when temperatures were between 37-39 degrees C. The greatest concentration of cells was observed in the temperature zone ranging from 33 to 34 degrees C. The significance of the thermal environment on sperm behavior and metabolism is discussed.