Forgive the sarcastic topic title, but my boyfriend is looking for a way to lengthen his penis...(what guy isn't, right?

)
my boyfriend is about 4.5 - 5 inches long, and I always tell him he's just the right size. I don't just say that to make him feel better; I say it because it's true. I wouldn't want him to have a monster 10-inch person xd. Heck, he already gags me when I give him oral sex - he doesn't need any extra inches.
I don't know his girth, but his length doesn't make him happy.
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Someone once told him he could make it longer by masturbating...But if that were true he'd be lifting up his rod to tie his shoes at this point xd.
I told my boyfriend I like his size as it is now, but he wants it bigger. But I told him as long as he wants to "grow it out" for himself and not for me or the guys in the locker room, only for
him, then i'll support him all the way.
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My question is this: is there any way, besides pills and surgery, that he can mke himself longer?
I'd really appreciate any insights on this issue ^-^
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Scaredbaka - has a stubborn boyfriend