Actually, there are two points in the comics where it's more or less confirmed that Hulk has a big dick. One is during the Peter David run with the Merged Hulk after he gets his clothes and most of his skin blasted off by Vector. The rest of the Pantheon complain and make him put some pants on because he makes them feel inadequate. (I will grant that the Merged Hulk is basically Banner's ideal version of himself, so it would make sense that the ideal version has a big dick.)
The other is kinda a two parter during a slightly creepy part of a recent Defenders comic, where Urda decides she has to have sex with the savage Hulk, presumably because he's well endowed (the creepiness is because this is basically the mind of four year old Banner... don't think the writers were really thinking of this at the time). He doesn't have enough "endurance" apparently because she tries again with the Worldbreaker Hulk later on.
Ehh, I'm willing to toss that up to artistic license. I mean, whose gonna be the one to point out how small the Hulk's dick is compared to the rest of his body? And given how those pants are holding on for dear life yet we don't see a bulge of any kind I'm inclined to think he's not packing a 2 foot long viper.
Jennifer probably would, but her version of the Hulk requires getting Banner's blood... something Banner is really insanely protective of. I think Samson was trying to approximate her control but with only radiation and also without turning green.
Not sure what's bad about turning green but OK. Think it's bull that such a traumatic and over-whelming reaction to the radiation would only appear in some tiny fraction of people but again, ehhh ... comic logic.
I think in actual terms of proportion Hulk's got to be pretty well hung.
That's the thing ... Hulk's not in anyway "proportional". His body just exaggerates the parts that could be used for violence from the PoV of a Traumatized child. If you look at the Hulk, he's not proportioned like a person. He's shaped like a Golem.
Plus, we have Gorillas who are known for being wildly beefy but without that proportion resulting in a "proportioned dick". That's pretty much how I think of the Hulk ...which is kinda mirrored with Shulk seeing as the place her Hulk comes from is a desire for attention and confidence and beauty which is why she's a sexy looking amazon instead of some golem looking thing.
