The Throttle Stroker can be worn at the base of the penis during intercourse as a comfy way to control penetration and prevent "bottoming out." You can double over the sleeve or to whatever depth you are trying to cut back. 

Improve your stroke the easy way with the ultra-soft, super-stretchy Jackits® Throttle Stroker by Screaming O. Made of body-safe SEBS, this squidgy sleeve is compatible with water and silicone lubricants and washes clean with soap and warm water for reuse again and again. Simply apply your favourite lube to the inside of the ring and place over your penis - the Throttle Stroker provides the sensation and allows you to control the pressure for just the right amount of satisfying squeeze.