Most guys have hair in their ass crack. And there is a
biological reason for that. Hair in the ass crack, like
the arm pits & groin area prevents chapping from our
movements. Also in more prehistoric times it wasn't
washed so that our musky,manly odors could be
emmitted for the girls.
I personally shave in those area to cut down on the
odoriferous bacteria & cling-ons (if you know what I mean)