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Regarding your question

what is the normal length of the penis ?

The male needs a penis length of 8 cm or more to complete the sexual process
If the length of the penis is 8 or more during the erection of the penis, there is no need for any intervention to enlarge the penis, as this length is sufficient to complete the sexual process, as the length of the vagina of women about 8 cm, and most sensetive to women in the first third of The vagina is about two and a half centimeters from the vaginal opening.

how to enlarge the penis ?

There are dozens or hundreds, of products that claim that it can enlarge penis, but for the moment no drugs, creams can enlarge the penis
The only way to enlarge the penis is through the operation, but the operation is performed only if ithe penis is less than 8 cm.
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