For me masculinity boils down to this:Well, in this case, I think it's only important that it means whatever the respondent thinks it means, but that's a fair point. We could probably make some safe assumptions that guys on both left and right are generally thinking of at least many of the same aspects when discussing masculinity: masculine guys are strong, like sports, can fix things, can handle their liquor, bang chicks, etc.
Very masculine people like to control their environment,
Very feminine people accept being controlled by their environment.
Of course much of the depends on given situations.