In your own opinions what would they be... ?
Most Helpful Guy
Definition in the chest and neck
Slim waist to go along with the broad upper body
Clean cut facial hair (or a f***ing beard)
Deep voice (so I guess the vocal chords for that lol)
And yes I'll say it, the man's phallic object
With the exception of the voice, I think my image of a "manly man" that I listed is similar to a Greek statue. They made their statues have definition as if they were athletes, laborers, or something else that meant the man was active and being physical. I think they did it well to portray an ideal manly shape.
Just my $0.02 though.