I must admit, I don't think I'd ever imagined that one day, I would have to grade the Bieb's masculinity vis a vis standard norms, but thus pressed, it looks like an 8. Likes sports, tried to hide his music stuff early on, chicks dig him, isn't afraid to have some controversial stances. He's actually pretty masculine when you pull him out of his fan base, it would seem.
I like your analogy. A nail is a nail. It's differentiated by which side it supports, but ultimately, they're all working at the same task, keeping the board down. I'm not sure where you're going with it on the topic of exercising potentials though. Could you expand?