The way I see it...
The bottom line is, as mentioned previously, he is secure enough in his manhood to appear in a movie, full-frontal and butt-naked for the whole world to see. All those willing to match that please step forward. I am cool with being nude in public, to an extent (beaches, gym, faceless body pic here, etc.) but I do not think I could do it in a movie for global distribution.
Shower, grower, hung, average, small, either you appreciate the view or you don't. He can no more change the size of his dick than he can his height (sorry PE folks I am just not convinced, no offense meant). I am always saddened when folks assign shame to a man's manhood for (apparent or actual) lack of size. Let's all be supportive of each other rather than judge each other as lacking. Yes, we are all entitled to our opinion, so that is mine.
The fact that he is with ZQ means that there is more to that man then meets the eye. I am sure ZQ could have his choice of hot, hung, studs and he has, by many accounts, chosen JG. Score one for Team Not-Hung-(soft, hard or both).
Finally, the voyeur in me is always curious what is behind the cloth. So, I'm always glad when the reveal occurs. In person would be better and "up close and personal"... awesome. In fact, JG's package brings to mind some great memories with similar sized guys....
We all have to work with what we are given - in one way or another. Kudos! and Thanks to Jonathan Groff for workin' his for our benefit.
P.S. Tonight on GLEE they are promoting the gay couple "gettin' it on", "knockin boots", "doin the nasty!" DVR is set.