Well some
of us don't have suitably stretched, floppy anal sphincters so as to allow anal inhalation. So you may have to develop your own.
( Dekazer, Wed 18 May 2005, 15:38, archived)

Mykey already talks out of his arse sometimes
it's only a small step to breathing out of it as well.

/apologies to Mykeys arse, but it had to be said I feel.
( Enigmatic ™                 Voice No More                  ©, Wed 18 May 2005, 15:41, archived)