This will piss off and bewilder some guys, but Brian's wasp waist isn't actually that aesthetic, just in my own opinion of course. It makes a man look weak, like you could snap him in half. There's a happy medium. Same with very thin hips and flat ass.
Aesthetic is somewhat subjective but there is such a thing as fairly objective measures as well, if you poll the average population.
Perhaps something like this is more "masculine" and powerful? Without looking it up, I don't recall the David statue having very thin waist either.
No homo, but perhaps judging males' physique aesthetics is somewhat homo, not sure, in that case I don't care...