@QuasirandomHmmm... my personal experience and conclusions.
The hormonal changes at puberty vary from individual to individual. Some of us are 'relatively' immune to these changes. In other words, they're not too severe. We go about life with some sort of balance between sexual urges and other life activities.
Others, like me, were beaten severely by these hormonal changes and go about life with a major focus on our sexual urges, not to the exclusion of other activities, but always with an eye toward does that activity 'feel good' in a sexual arousal manner?
My maleness was never more than average - as best as I can tell. But I do have a memory of being 23-24 and a girlfriend exclaiming 'you are HUGE'. I wasn't, but she excited me so that I was rampant. That was an ego boost!
As for changes in size. 7th grade was physical education and a shower after before going to the next class. I recall no specifics, but I do recall most of the boys were hairless and small.
In 8th and 9th grades, that changed and most had pubic and armpit hair. Some, like me, had sprouts of chest hair.
After high school and in the military most were 'fully developed'. Again, I cannot recall any one individual that appeared to be 'hung'. But then again the communal showers were not a place to show off.
Having puberty hit me so hard, my memories suggest that I 'grew' the more I played. As my body aged and the various hormone levels changed, I lost a bit of length. I think the potential of the flesh was still there, but the blood just did not fill it up as much, thus the appearance of shrinkage.
Now, I'm deep into male menopause and a 'chubby' is a miracle. Orgasms? Mostly, a fond memory.
As always individual circumstances and experiences will vary.