I think it’s kind of a strange hypothetical.
As others have pointed out, the anatomy involved does have adaptive tendencies regarding heat and cold, not to mention stress.
Trying to boil down priorities: erect versus flaccid size …
I don’t know, both are important to self-image in different ways.
I think function, however, is the most important to me. To be able to get and stay hard and give the woman the ride of her life.
That’s not dependent on size.
I don’t want to duck the question of your hypothetical.
Of the two 4” to 6” is the lesser of two evils - because I was just slightly larger than that at one time and did just fine with the ladies - which is where my priorities lie.
To have a penis that goes from 1” to 8” is circus freak material. You’d be weirdo mutant boy; you’d look funny in the gym or on a day to day basis with your woman, and you would bottom out in a lot of women when erect. I guess you could parlay that into a porn career or something - just from the novelty of it, but … I think I’d rather be normal than freakish.
This “much bigger is better” thesis is not so true in my opinion - not with most women. My current size (7.5” BP) is about as long as I want. Much longer and I won’t go balls deep as easily. I am bottoming out on most of my partners and in certain positions I can’t go all the way in without hearing “Ow.”
I’d rather have good sex than sex she can barely tolerate or to be thought freakish.
So that’s my answer.
Before: I'd like to show you something I'm very proud of, but you'll have to move real close.
After: I\'d like to show you something I\'m very proud of, but you guys in the front row will have to stand back.
God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time. - Robin Williams (: