>>12730086Balding correlates with high testosterone. Although its unattractive, you only start balding later in life. Because high testosterone is desirable, they are able to pass on their genes before they go bald, therefore it stays in the population despite being undesirable. Same reason some women age really badly, You only need to look good when you are looking for a partner.
>>12730149Hair is expensive and ineffective for humans
hair preserves heat, according to my cooler bald friends, I highly doubt it would be significant, by I also doubt hair would be expensive to maintain, to any remotely meaningful degree.
