Depends. Some methods seem to be getting better responses than others. “Studies are being done to improve male girth through injections of hyaluronic acid, which is used as a filler (and is used in orthopedics to improve knee arthritis),” says Dr. Steve from SiriusXM's Weird Medicine on FactionTalk. (Here's a study that supports what Dr Steve is talking about). “The average vagina is 4 inches deep, so girth is much more likely to enhance pleasure for the woman than an increase of length, given that the average male penis length is approximately 5.5 inches,” says Dr. Steve.

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.[8]
Last but not least, the biggest problem of a small penis isn’t the penis itself, but guy attached to it. Every penis is different and unique, you can have a wonderful and sexually fulfilled life even if your size is below average. Always keep in mind that the majority of sexual stimulation a women feels during intercourse comes from her clit, not her vagina. Additionally, there is much more about being a man than the size of what you are carrying around between your legs. That’s probably the most important and valuable advice we can give: Try to relax, a large penis doesn’t automatically or magically make you happier or more adorable for women. Don’t let your penis size control your self-esteem.
A small penis isn’t more sensitive than a larger one, but surprisingly there is some correlation, many men with a relatively small penis report that they ejaculate prematurely. From the purely medical point of view, this could be conincidence, but not from the psychological. No matter how important or unimportant penis size is for the female partner, men with a smaller penis often feel unsecure, at least subconsciously. Insecurity leads to stress and bodily tension, which encourages coming too fast. This subjective failure causes even more stress the next time, a cycle that’s hard to break. That’s the main reason why penis enlargement often assists in lasting longer in bed, too.

The question most men probably care for most. While many woman claim that penis size isn’t important for them and it’s all about the right technique and a loving partner treating them well, that’s only half the truth. In totally anonymous surveys, the number of women claiming that penis size is important for them, at least from a aesthetic viewpoint, is significantly higher than in face to face surveys. This fact doesn’t mean a smaller penis can’t satisfy a women, it doesn’t mean you can’t have a perfect sex life with a small penis, but the the harsh truth is: Size matters, at least for some women. No need to panic if you have a small penis, according to a combined study of several reasearch institutes since 1942, 85% of all women are happy with the penis size of their partner, while only 55% of all men are happy with their own penis. So, the percieved problem is bigger than the real one.
The average flaccid penis is between 3.5 and 5 inches long and 3.5 inches around, while the average erect penis is a little more than 5 inches in length and 4.5 inches in girth. Some men feel inadequate, even though their penis size is perfectly normal. Nearly 70% of men say they’re not happy with their size, and about half wish they could be larger. 
“The majority of men who come in seeking penile enlargement are average,” says Lipshultz. “I just don’t think men have a realistic idea of what normal is. Hence they think that they are below normal when actually they’re average.” (For the record, the average erect penis measures 5.6 inches, according to research published in the Journal of Sexual Medicine.)
Lose belly fat. Your penis may look smaller than it really is if it's partially obscured by skin that droops over the top. Losing belly fat is no simple task, but it can make a big difference when it comes to the perceived size of your penis. Start taking measures to lose weight and you'll likely see improvement in other areas as well. According to a report from Harvard, men with a 42-inch waist are 50 percent more likely to have erectile dysfunction (ED) than men with a 32-inch waist.[9]
A new review in the journal Urology found that strengthening a man's pelvic floor—the muscles that surround the base of your penis and form a shelf across the bottom of your pelvis—can help diminish erectile dysfunction and premature ejaculation. How so? When you get hard, your pelvic muscles keep blood in your shaft. This helps to enhance and maintain your rigidity, says urological surgeon Andrew Siegel, M.D., the study's author and creator of pelvic floor exercise DVD Private Gym. And for premature ejaculators, squeezing those muscles can delay your orgasm. The stronger these muscles, the better the effect, Dr. Siegel says. 
Neither food nor any supplements influence penis growth or size. That’s the reason why all the so called penis pills offered on the internet simply don’t work at all, don’t believe all the fake promises. All those pills increase the blood flow only, which may cause a harder erections, but the effect instantly stops once you stop taking those pills. We examined and tested dozens of different pills over several years, none of them was able to deliver permanent results.
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.
During exercises, the spongy tissues are stretched or expanded to increase their maximum blood capacity. A higher volume of blood leads to the formation of micro-tears in the surrounding smooth muscles. The body will repair these tears and encourage the growth of new cells. It’s the same principle that explains how bodybuilders gain new muscles when working out in the gym.
Some men seek injections of natural and synthetic fillers to increase the girth of the penis. Others seek surgery if a smaller penis size or penile abnormality (like hypospadias) is interfering with the ability to urinate or quality of life. Small penis size usually is not an indication for surgery to treat infertility. In such cases, assisted fertility procedures may be the better option.
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