The Fleshjack Endurance Jack Ass Stamina Training Unit has been designed to enable you to last longer then ever, in the bedroom. The Fleshjack Masturbator helps train you, to increase your stamina over time during penetrative sex. The key to improving your stamina is to practice and the Fleshjack Endurance Jack Ass Training Unit is the perfect training equipment. Each Fleshjack Endurance is supplied with their patented Real Feel Super Skin Masturbation sleeve. The sleeve has been purposely designed with a textured inner canal to replicate the intensity of intercourse. Fleshlight even state if you can last 10 minutes in the STU, you can last 20 minutes in bed with anyone, with enough training of course.