As a cancer survivor who lost all of his hair during chemo, and I do mean all of it, I can say with certainty that ass hair acts as a “fart silencer”. Without hair, my farts were a sonic cannon, capable of overpowering even foghorns. With hair down there? Complete and utter silence. The haunting nothingness of the void just around the bend.
No doubt humankind evolved hirsute hafts as a means of keeping off predators; the lone slip of a booty blaster at night would have called all of the wolves to the yard. Hence, hair.
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