“Unicorn” describes a person who joins a couple as their third partner, for sex or even for something more committed.
What is a bull man?
b : a usually adult male of various large animals (such as elephants, whales, or seals) 2 : one who buys securities or commodities in expectation of a price rise or who acts to effect such a rise — compare bear. 3 : one that resembles a bull (as in brawny physique)
What is a male cow called?
An adult male is known as a bull. Many male cattle are castrated to reduce their aggressive tendencies and make them more tractable. Young neutered males, which are primarily raised for beef, are called steers or bullocks, whereas adult neutered males, which are usually used for draft purposes, are known as oxen.