It seems they work better that way, because sperm production works best slightly
below human body temperature.
Not exact matches
The study developed a new in vitro system made from bone marrow stem cells and studied what would happen if its ambient
temperature fell
below 37 °C (the natural
temperature of the
human body).
Hypothermia — Dogs are subject to hypothermia just as
humans are, and if your dog's
temperature falls
below normal (100.5 to 102.5 degrees F) and stays there, it means your dog is unable to regulate its
body temperature and needs assistance.