Donk: OK, I don't like to chime in with accusations about posters exaggerating their sizes and such and I'm not real good with metrics. But I can't help mentioning that, by my calculations, your penis is about 14 inches soft and about 15.5" hard. Just makes me wonder (1) why you would worry about making it look any longer and (2) how you even fit it into Levis. Just curious.
In answer to the question, I trim the hair on my penis (goes all the way up the shaft) and my pubes with an electric trimmer. I trim it just enough to keep it neat, not to look like it has been shaved. Doing this never even occurred to me until a few years ago when a girl commented that I had a rather bushy appearance down there, which brought it to my attention.