I've noticed that wearing a ring after manual exercises and after using the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98 ]Bathmate[/words] helps keep me "engorged", but doesn't stop me from "turtleing", so I plan to purchase a silicone sleeve.
Also, I'd recommend using a ring any time you are erect. I wear mine as much as possible just to "help" with my exercises.