I suspect that anyone who has seen a teenager lately thinks that they are viewing a huge, hung penis. Just think back when you were 14, 15, 16, 17 and 18!!
I recall that I did not have any hair at all below my navel. The penis was there all by itself. As someone posted here earlier, as one gets older the body changes and the stomach is not as flat, unless one works out. This also covers the base of the penis. That is why bone pressing is the method to measure penis length. I know that when I shave the hair on my shaft and trim the pubic hair near the base of my penis that I look longer. I shave, as I have stated before, because I am an avid condom user. I just do not like the hair getting rolled up in an expired condom.