Like I said, comics.
How does Hulk's pants stay where they are? The gluteus Maximus is the largest muscle in the body, so logically, any growth would hit that area like a ton of bricks etc etc.
And sure, we can assume he later grows organs (even though it was never shown). I can just as well assume he develops telepathy and reality warping, even though it was never shown.
Not being snippy, likeParm, am merely pointing out what was shown.
This bio also says he has no organs:
And in H/P, he had no organs either.
Let's be honest here, if I thought he had organs, Susan Storm would've been first on the scene lol.