The penis consists of 3 chambers of spongy tissue which absorb blood that reach the penis from the circulatory system. As these chambers fill with blood, it leads to the erection of the penis. When exercises are done continuously, in a right way, it will cause an expansion in the size of the chambers. Then, it will become able to absorb larger amounts of blood and this will lead to an increase in the size of the penis, and the purpose of these exercises is to create a tensile strength by stretching the tissues that are responsible for erection of the penis and this tensile strength will lead to an increase in the growth of those tissues, gradually. 

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That’s usually because they’re not getting enough blood flow to the penis, which could be the result of being overweight, smoking, increased cholesterol, high blood pressure, diabetes, or cardiovascular disease. So the first step in your penis-growing experiment should be to get the rest of your body healthy — especially your cardiovascular system. “What’s good for the heart is good for the penis,” says Fisch.

“There’s no legitimate way to do it,” Danoff said, explaining that, unlike the breasts or the nose, the penis is not a static organ, it needs to move, and “there’s not a grafting material that’s suitable for that.” While there is one procedure that involves cutting the suspensory ligament, this only gives “an illusion of length,” he said. It doesn't actually extend it.
These products usually contain vitamins, minerals, herbs or hormones that claim to enlarge the penis. Despite their impressive claims, there's absolutely no clinical evidence that these products work and some may even be harmful. The University of Maryland in the US carried out an analysis on some of these and found traces of lead, pesticides, E. coli bacteria and animal faeces.
Sometimes men with erection problems or a diminished libido have low levels of testosterone, Boyle says. Testosterone deficiencies can also affect mood and energy levels. Boyle tests for testosterone levels and prescribes it as a topical gel, though she warns it is only safe when prescribed and monitored by a physician. Nonprescription testosterone, such as the kind used by some bodybuilders, is dangerous, she warns.
Though generously endowed by nature and confident enough in his body to have appeared in some adult films in his 20s, O’Connor decided to enhance his girth in 2013. “It was just something I fancied,” he says with a shrug. “Some men have hair transplants or belly tucks. I wanted a truncheon in my pants. My whole life I’ve enjoyed impressing women; this was just an extension of that. You could call it a gentlemanly thing to do.”
Short of cosmetic, reconstructive surgery, there's not really much you can do.  There are no magic pills – drugs or herbal – that are going to do it for you.  Any of these that have any actual safe effects just promote effective blood flow within the penis, which is what's responsible for causing an erection.  Increasing the bloodflow safely in the penis will allow the fullest erection you can physically have, or might prolong erection.  But you can't get a bigger penis in this way safely.
Here's why sexologists say size doesn't matter. Any size penis can provide great pleasure for the man it's attached to. An estimated 95 percent of penises are average size (3 to 5 inches flaccid, 5 to 7 inches erect). Very few are significantly larger or smaller. When women have been surveyed about what they want in a lover, they consistently mention attractiveness, kindness, caring, listening, sense of humor, and shared interests and values. Very few mention penis size. Finally, sex therapists report that women clients almost never complain about their partner's size. As a result, most sexologists say size doesn't matter.
Atherosclerosis, a condition in which fatty deposits build up inside arteries, may restrict blood flow to the penis and cause erection difficulties. "The small blood vessels that go to the penis can become diseased much earlier than the [larger] vessels that go to the heart," Karen Boyle, MD, a urologist at Johns Hopkins School of Medicine, tells WebMD. "In younger or younger middle-aged men, ED is often the first sign of atherosclerosis."
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