Tom Lehrer

Sharks gotta swim,
and bats gotta fly,
I gotta love one woman till I die.
To Ed or Dick or Bob
she may be just a slob,
but to me, she's my girl.
In winter the bedroom
is one large ice cube,
and she squeezes the tooth-paste
from the middle of the tube.
Her hairs in the sink
have driven me to drink,