Phalogenics Extender JES caters mainly to problems such as small penis, smaller circumference and also eradicates Petronies disease (excessive curvature of penis). Whatever the cause may be, Jes Extender should be used for a period of time to deal with them. The extender is a simple device that contains your penis at two ends (upper and lower), in which they are connected through extension rods that can be adjusted in .