In either case there are many methods used to achieve the wanted result, but none of the methods are well investigated scientifically, so that the judgment of the methods must be based on personal reports from men having tried them.
A group of methods are based on a daily stretching of the penis in a long period.
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The common length of an erect penis is from 12.9 to 15.0 cm (5.1 to 5.9 inches), which is shorter that commonly believed.
Other times a man thinks he simply will feel more well with a bigger penis, which might be right or wrong.
These will be filled with new cells so that the tissue expands.