Researchers asked 81 healthy men to rate the erotic sensitivity of different areas of their bodies, including not only the penis but also zones such as the scrotum, anus, nipples, and neck. Many men consider the underside of the glans (head) of the penis and the underside of the shaft to be most sensitive to sexual pleasure. About 12% of penises gained one-third or less of their total length with an erection, and about 7% doubled in length when erect. Kinsey's data suggest that most penises aren't extreme show-ers or growers.
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And the guy whose penis looks tiny might get a surprisingly big erection.Īn analysis of more than a thousand measurements taken by sex researcher Alfred Kinsey shows that shorter flaccid penises tend to gain about twice as much length as longer flaccid penises.Ī penis that doesn't gain much length with an erection has become known as a "show-er," and a penis that gains a lot is said to be a "grower." These are not medical terms, and there aren't scientifically established thresholds for what's a show-er or a grower. You can't assume that a dude with a big, limp penis gets much bigger with an erection. Whatever the clinical significance of these data may be, the locker-room significance is considerable. In one study of 80 men, researchers found that increases from flaccid to erect lengths ranged widely, from less than a quarter-inch to 3.5 inches longer.
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Your Penis May Be a 'Grower' or a 'Show-er'Īmong men, there is no consistent relationship between the size of the flaccid penis and its full erect length. Without regular erections, penile tissue can become less elastic and shrink, making the penis 1-2 centimeters shorter.Ī device like a vacuum pump, which forces the penis to swell with blood, can help men with physical erection problems maintain a healthy penis, Kohler says. "If they don't do anything to maintain normal erections, they will get shortening of the penis," Kohler says. It doesn't matter if you're having a hot sex dream or a zombie apocalypse nightmare - your penis gets hard during that period of the sleep cycle.īut some men are physically unable to get erections, such as those who've suffered trauma to the nerves involved or who have nerve or blood vessel damage caused by diabetes. Impulses from the brain cause erections during the dreaming phase of sleep, called the REM phase.
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The brain has an automatic penis maintenance function built in. If guys are physically able to get erect, but never have erections during the day - maybe they find themselves in very un-erotic circumstances for a long time - they needn't worry. To maintain a healthy tone, the smooth muscle of the penis must be periodically enriched with oxygen by the rush of blood that engorges the penis and makes it erect, Kohler says. "It has to be essentially exercised," says Tobias Kohler, MD, assistant professor of urology at Southern Illinois University School of Medicine. You need to have erections regularly to keep your penis in shape.