What purpose do they serve? They serve no useful purpose whatsoever, the only thing they do is trap moisture and cause dingleberries to form. Fuck asshole hairs! If you try to shave em off you end up with aside from razorbumps, short stiff pointy asshole hairs that are prickly and uncomfortable, if you try and wax them off, there's gonna be a small open wound in the hair follicle and bacteria from SHIT is gonna get in there and cause extreme itching as they become mildly infected for a while. Forget genetic research into cancer, start researching how to stop people from having asshole hairs.