I'm with Sunkist Girl on her first choice
Sean Connery - who even at his age has a sexy, masculine demeanor
Kevin Sorbo - at least in his Hercules days.
Sullivan Stapleton - from the Cinemax series Strike Back
Morgan Freeman - voice and demeanor
Jason Mamoa - from StarGate Atlantis
All of these men exude masculinity. I adore very masculine men and the taller the better.