For a chuckle.
I copied this from a link @ WebMd. Now Dr. Lue states that the penis is a muscle. I think they’re just jealous.
Jelqers may believe that the technique works, but they are mistaken about how. You may hear that by pushing blood into the erectile tissue of the penis, you can expand the chambers — the corpora cavernosa — so they eventually hold more blood, resulting in bigger erections. You may also hear that jelqing exercises the smooth muscle of the penis, making it bigger and stronger.
“I think that’s all bogus,” says Tom Lue, MD, professor of urology at the University of California, San Francisco. He says that only swelling, caused by bleeding under the skin, could explain the increases in penis size men like Thomas experience. This result would not be permanent, hence the need to follow a rigorous jelqing regimen indefinitely.
The idea that the smooth muscle of the penis can be exercised , like the biceps, is a myth. “Smooth muscle doesn’t respond that way,” Lue says. In fact, stretching it can be harmful. For example, the bladder is smooth muscle. According to Lue, if you hold in urine so that the bladder expands too much, the tissue weakens.
What’s more, Lue says, all the stretching, pulling, and squeezing might cause scar tissue to form in the penis, which could hinder a man’s ability to get an erection. But Thomas maintains that apart from a little soreness, he hasn’t injured his penis by jelqing, and he says his erections last longer than they did before.
“Anatomically and physiologically this is just wishful thinking,” urologist Ira Sharlip, president of the Sexual Medicine Society of North America, writes in an email. “It’s all baloney until a real study with objective before and after measurements, verified by an independent source [since you can’t do a placebo comparison], proves that it works.”