sheath

The outer covering of an animal's penis. It serves as protection for the penis. It can be found on most mammals save for humans and apes. In other creatures a genital slit serves the same purpose (dolphins, whales, reptiles). The sheath can also be referred to as the prepuce or foreskin, all terms are synonomous.

The stallion's sheath was full of smegma and needed to be cleaned very badly.

by B-Wolf November 20, 2006