By your reasoning, it also grows out of ears and nose after a certain age. That also looks unsightly, and as with beards, most people have the good sense to remove it.
Some go even further. Nosey tells me that John has a lovely smooth, waxed meat and two veg.
My (easily embarrassed) MIL asked me one year what I wanted for Chrimbo. I said a sack, back and crack waxing please. Failing that, six months subscription to Razzle magazine will do.
I ended up with the first mag landing with the December issue.