I've never sucked at a gloryhole. Never see them. But I get super turned on being watched sucking a stranger in an adult theater. There are 2 close to where I live. When I'm my knees and they are leaning backed seated and someone else comes and sits by us, stroking and watching me perform magic on a smooth slippery head and shaft with my met lips. Fantastic. If I'm quick enough I can catch the other guys load before he starts spilling it on the floor