I assume you mean "penis", it is the male genitalia. The penis is used for both urination and procreation.
because they both love it and girls think it feels great.
Haha. Why are you even asking this question? The answer is NOWHERE! He isn't a perv who does that. Sorry, if you're disappointed.
may be is just dat ur puberty hasn't started yet
Oh, dude, you're really fixated on the specifics, huh? Well, technically, penile growth varies greatly during puberty, so there's no one-size-fits-all answer. But hey, as long as everything's functioning properly and you're healthy, does it really matter if you're a little above or below average? Just roll with it, man.