You might wonder what a cock ring is. The answer is simple enough: It's a ring that is placed on a penis.
The purpose of a cock ring is to restrict blood flow by keeping blood in the penis. Why would men want to do this, and why would women want their men to wear one? Simple.
A cock ring allows a man to be harder and to stay hard longer. Your man should also feel a more intense orgasm since the cock ring makes him take longer to orgasm.