It can bring about symptoms like distorted perceptions of penis size, constant feelings of shame and embarrassment, reduced libido and sexual function, and difficulties in having sex due to strong anxieties about penis size. But before we answer the question: “do penis extenders work,” let's talk about the ideal penis size. Penis extenders have been used medically to treat Peyronie's disease, a condition of unknown cause that results in the abnormal curvature of the penis. Several studies have been conducted to see if penis extenders can really increase the size of the penis. Gontero's team concluded that the penis extender could increase penis size permanently when recommended usage is followed.