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We'll try to answer your question as simple as possible. For starters we need a good understanding of how the penis is constructed, and how it works. The penis is composed of three chambers; the two cavernous bodies (or corpora cavernosa) which lie side by side on the top of the penis, and the spongy body (or corpus spongiosum) which is centered below the other two. The spongy body surrounds the urethra, and extends out the end of the shaft to form the glans. All three chambers contain small hollow areas that can fill with blood to produce an erection. Surrounding all three bodies is a semi-elastic membrane called the tunica albuginea. The arteries that feed blood to the penis are surrounded by smooth muscle fibers that normally limit blood flow to the penis. When a man is aroused by thought, sight, or physical stimulation, the muscle fiber relaxes and blood flow into the penis increases. The spongy tissue of the penis fills with blood, causing the penis to swell. The size of the erect penis is governed by the tunica albuginea membrane, just as a bicycle tire limits the expansion of the inner tube inside it. As with a bike tire, once the limit of the membrane is reached, further pressure results in firmness rather than expansion. The veins that drain the penis lie close to the surface, and are compressed by the erection, thus slowing flow of blood from the penis. The only muscle in the penis is the smooth muscle fiber that controls erection, and this muscle can not be built up in the same way skeletal muscles can be. Even if this muscle could be strengthen, doing so would only serve to reduce blood flow to the unerect penis, making it smaller. In order to lengthen the penis the tunica albuginea and the spongy bodies would all have to be lengthened. The tunica albuginea is flexible to a point, but repeated stretching does not lengthen it the way the ear lobes can be lengthened.