IMO
burnthesheep said it best above when he describes it as swagger.
To me, a semi conservative white hetrosexual male, sexy doesn't come up when I look at another man. My definition of sexy has a lot more to do with (for instance) a beautiful woman. By proxy I feel that some machinery (and particularly of the fast types) can be sexy as well. By continuance, I have never thought of myself as sexy, regardless of activity.
I have had swagger.