Not permanently, just if you get a erection.
No
The urethra runs from the Bladder to the end of the penis. so it will be an inexact length, and will extend and contract with erections. The common length is about 3" from the base of the penis to the bladder then add the length of the penis. so in a flaccid male it would be approximately 6-8" total length.
Penis length has nothing to do with weight.
Four inches is a bit below average length however it is enough to have sex quite effectively. The only real difference is that you have to be a bit more care full that you don't come out on the backward stroke. However depending on your age the situation may still change. And above all it is not the size of the penis that decides the quality of the lovemaking.
There is no proven method of penis enlargement, except for an expensive surgical operation to loosen and extend the muscles that hold the penis.
No, it doesn't. The length of the penis is determined by the erectile chambers within the penis (the corpus cavernosum), not by the length of the penile skin.
You take the shaft of the penis in your hand, and stroke it furiously.
No. While zebras and equines are proportionately large, the tapir has a higher ratio of penis length to body length.
Penis. No, it has no affect on it.
There is a great variability in the length.
not if your penis doesn't extend past your testicles
Six inches is average; 5.7" is close enough to qualify as normal. And the precise length of a penis is much less important than many people imagine it to be.