I would say it is several bodily functions that do. The human is a warm blooded creature and this is because his heart pumps blood around the body. Because the sperm is produced inside of the male body, it has the same temperature, however core temperature often differs from the temperature of different organs or different areas inside the body, that is why seamen may seem a little hotter than the body.
The Cremaster muscle encases the testes and raises or lowers them to maintain an optimum temperature for spermatozoa.
Testes or Testesterone
Scrotum
The best temperature of the testes for normal sperm production is 1-1/2 to 2 degrees below body temperature, so, say, about 97 degrees.
37 degree below
Lower than body temperature
Sperm develops best when at normal body temperature. They are very sensitive to temperature changes. Thus, the body does everything it can to help regulate the internal temperature to help protect the reproductive area.
The best temperatures that sperm are produced is 37oc. if the temperature is higher than this then the scrotum lowers and if its colder than this the scrotum contracts and becomes more wrinkly.
It's actually to regulate the temperature for sperm production. HAWT DAWG
The sacs located outside the body and in which the testes are suspended are called the scrotum. The scrotum is a pouch-like structure that contains the testicles and helps regulate their temperature for proper sperm production and development.
The length of a man's genitalia varies depending on the individual, with the average size being around 5-6 inches when erect. The reason why it hangs low is due to the presence of the scrotum, which houses the testicles and helps regulate their temperature for sperm production.
Temperature
The best temperature of the testes for normal sperm production is 1-1/2 to 2 degrees below body temperature, so, say, about 97 degrees.
37 degree below
Testicle temperature regulation is essential in maximum sperm production.
Lower than body temperature
The sperm need to be cooler than body temperature, hot tubs increase the temperature of the testicles above body temperature and production of sperm is decreased.
The best temperature to keep sperm alive is with the human body. You may realise that during very cold temperatures your scrotum tends to go closer to your body. This is because they want to get the body heat. Once the sperm leaves the penis, it will not survive for very long.
Your scrotum adjusts to regulate the temperature of your testes so they are at the perfect temperature for making sperm.
Production of sperm is reduced. The testicles need to be cooler than core body temperature for the production of numerous and viable sperm.