Key aspects of penile implants: Types of Penile Implants: There are two primary types of penile implants: inflatable and semi-rigid. Inflatable implants consist of two inflatable cylinders surgically implanted in the penis, a fluid reservoir placed in the abdomen, and a pump located in the scrotum. When the user activates the pump, it transfers fluid into the cylinders, creating an erection. Semi-rigid implants involve flexible rods implanted within the penis, allowing it to be manually positioned for intercourse.