what temp does sperm need to be at
Testicles hang  outside of your body because optimal sâ¦perm production requires a  temperature 1 to 2 Â°C below the core temperature of 37 Â°C.    After an hour in the hot seat, participants' scrotal temperatures  rose to an average of 37.3 Â°C, with a maximum temperature in one  man of 39.7 Â°C.