
30. That Is A Manly Thing To Do
The human male has some body parts that differ from the human female. This is obvious to us, of course, but one thing is perplexing. For women, they have their reproductive tools inside their body. Yet for men, there’s a penis and testicles just hanging on out there. What is up with that random bit of human evolution?
The reason for testicles alone being outside the body, and even hanging down more when men are warmer, is pretty interesting. Sperm, the man’s useful tool to help create new life during sexual relations, dies when it gets too hot. The sperm actually dies at the normal body temperature of 98.6 degrees Fahrenheit but can survive at 92 degrees. Therefore, the testicles hanging down away from the body keeps the sperm safe from death.