Exercise your pelvic floor. You may not be able to build up the penis itself through exercise, but if you strengthen your pelvic floor your body will be better able to hold blood in your penis. The pelvic floor presses on the vein that keeps blood from leaving the penis during erections. You can strengthen your pelvic floor using Kegel exercises. A trial conducted in Britain concluded that men who performed Kegel exercises experienced better sexual function than those who made other lifestyle changes but didn't perform the exercises.
How do penis extenders work? There are two fastening points: “One at the base of the penis and one just before the glans," says Rybchin. These connect to bars or rods that "extend the length of the extender. The bars or rods are lengthened by the wearer to stretch the penis over time. Where design differences come into play is the mechanism by which the rods are lengthened and the comfort features (such as padding) of the device itself."
A numbing cream, followed by an injected numbing agent, prevents pain. “Depending on the patient’s goals, a filler is chosen and then injected into the corpus cavernosum of the penis [two columns that contain most of the blood during an erection]. The filler is then worked through the penis, to achieve a uniform increase in length and girth,” says Cedar Grove, New Jersey, physician Dr. Muhammad Mirza in a RealSelf Q&A.
And if you're worrying about your size pleasing your partner, remember that penetration is just one part of sex, and everyone's preferences are different. Many women don't even orgasm from penile-vaginal sex, for instance, and other people don't care very much about size or length. The size of your penis could possibly be unrelated entirely to your partner's ability to experience pleasure.
Lengthening the penis. The most common procedure is to cut the ligament that connects the penis to the pelvic bone. This allows a little more of the shaft -- on average less than an inch -- to become visible outside the body. It's not really lengthening the penis so much as revealing more of what's usually hidden. To prevent the ligament from reattaching, a guy would need weights or stretching devices daily for about six months.