Why do you think 3.5 inches is pathetic? That’s completely average, in my experience. If you’re looking around the locker room and seeing a lot of 5” flaccid hangs, you’ve either joined a PE Gym ;) , or you’re misperceiving other men’s penises in comparison to your own (as many do here). I mean, really now, supposing the average dick is 5 to 5.5” NBP (6” BP) ERECT, how big can it be flaccid?! I’ve heard of showers, but only gaining an inch or a half inch from an erection is rare.
There’s a few points to consider. Firstly, I’m guessing that those loitering dick-swingers, common to men’s changerooms throughout the world, are most likely somewhat larger - on average - than the rest of the population. You’re just not going to see as many guys with micro-penises swaggering around - with the exception of shameless old geesers from a bygone age.
Secondly, while not being an immense man, I’m certainly more muscular than average, and at 5’11 and 3/4s i’m also slightly taller. This makes it far more difficult to be comfortable naked because my penis is disproportionately small - I don’t even want to imagine what it’s like for the giants of the forum like MM, Twat, Dino and Wad. Frankly, my ego will not permit having some skinny dorks lording it over me just because they hit the phallic jackpot.
On a somewhat unrelated note, did you guys know that Schwarznegger once admitted in an interview - I think in the 70s - that he had a disproportionately small penis. He said, “one thing’s for sure, when you work out it doesn’t make your penis bigger.”