Original: For the human , a temperature should be one or two degrees below the body temperature - 36.8 degrees Celsius ( 98 degrees Fahrenheit ) ; higher temperatures may be damaging to sperm count .
Simplified: Human testicles work best at 36.8 degrees Celsius ( 98 degrees Fahrenheit ) when normal body temperature is 37 degrees Celsius ( 98.6 degrees Fahrenheit ) .