Human’s homo ancestors were likely much hairier than we are. Think chimpanzees and gorillas, not hairless cats. Why did humanity evolve to lose their body hair? There are many theories, including Darwin’s that it was because our ancestors preferred less-hairy mates (in biological terms, sexual selection pressure), and that less hair meant less parasites and therefore a better chance of surviving.
The most popular theory today is that we evolved less hair to assist with regulating our body heat (in biological terms, thermoregulation). During some evolutionary phase after our ancestors became bipeds, they were regularly walking or running in open, drier habitats. Such activities in such an environment would make overheating a serious risk. Reducing body hair, to reduce heat trapping, and increasing sweat glands, for more effective evaporative cooling via perspiration, would therefore be evolutionarily favored.
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