The correct answer to this question is Specific heat. The body is smart. It can indicate specific temperature situations that the body is in. When the body is cold, it shivers to generate heat. The body can also indicate when it is too hot.
To cool the body down quickly, the body sweats to release some of the heat. Humans have sweat glands in their body. These glands activate when the body knows it needs to cool the temperature down quickly. Humans are unique in having sweat glands, for not all mammals have them. While horses and other large primates have them, many others don't.
The human body has certain defenses for itself in specific situations. One such defense is the ability to sweat should the body temperature need to be cooled quickly. Most animals do not have large numbers of sweat glands like humans do.
Only primates and horses have large concentrated sweat glands the way humans do. The polarity of water allows water to have a high specific heat which allows us to maintain or return to homeostasis when we sweat. This is one of the things that allows humans to survive as we are today.