There are many different reasons why a man will chose to get or try out a glans or cock ring. The purpose of a cock ring is to slow the blood flow to make the erection be more sensitive and last longer. The cock ring can be placed anywhere on the shaft of the penis however it works better if it is put on the penis closest to the body. Some men just enjoy the pressure caused by wearing a ring and some like it for the looks of it. A glans ring is supposed to be positioned right after the head of the penis. The most important part in selecting a glans ring or a cock ring is make sure to get the right size for you. Serious issues can arise if the ring is too tight.