What are good and bad words for the anus?
Ass, asshole, hole, manhole, mangina, pussy, boypussy, love canal, Reiner, butthole, bunghole, backstage, orifice, cock port, chimney, porthole, etc.

The mouth has many functions including to: eat; drink; breath; talk; whistle; vomit; sing; spit; hum; cough; sneeze; smile, frown; lick; kiss.
Seems that the anus should not be relegated to nothing but poopy and farting.