Why do we wear underwears? This is an interesting an worthwhile question. In the medical view point, apart from making us feel secure mentally, underwears serve no other functions. Somebody even feel that underwears are the source of pressure. Somebody have done an experience with monkey, making them wear shorts, the monkey being bound died a week later. There are many kinds of pressure in today's society, you may put away all other things, using the method of "Nude Sleep" to have a good sleep. Human being originally have the ability to produce enough heat. Also, when our skin touches some cloth, our body will feel warm gradually, and we may eventually fall asleep.