It has always seemed to me that men who are hung over seven and a half inches are much more forceful and much more self confident than many lessor hung men (This is not always the case, but enough to say usually). Considering the very large amount of rejection both professional actors and athletes must face early in their careers and the amount of concentrated work it takes to maintain their professional positions, the amount of self confidence they have must be very far about average. The cause of the self confidence. I'll leave that conclusion to you.
I have also found that men who are well hung are much more relaxed about public and or casual nudity. Both actors and athletes are frequently undressing and dressing in public and semi public situations, again it is logical to me that those who are the best hung have the least inhibitions about dropping their towels without concern.
I also strongly consider that the word "rumor" plays an important role in the mystery of a star and know that several (not many) bona fide male sex symbols in both the performing arts and sports world would be considered "Princess tiny meat" at any hot sex party, so who knows.