i'm 7 inches long and 6 feet tall and could suck about an inch when i was a teenager, but it hurt to stretch that far. only ejaculated that way a few times. i'm 29 now and i can't reach it anymore.
i think it would be HOT if i could take turns sucking my own cock with my woman.
i also tried sticking it up my own ass but i'm only 4 inches floppy so i can only touch the glans to the asshole. i think it would be fun though. i bet it would be awesome if you could stuff your balls up your ass.