The purpose of a cock is to connect 2 people. When you put your cock through a glory hole and someone latches onto it, you are now connected in the most intimate and personal way...and it feels GOOD!
At my local GH the vast majority of men are married, as evident by their wedding ring. Nothing is better then seeing a my tool getting worked on with a wedding ring on. Of course I have one too...and I'm a feeder OR top!