Carlsen has a rugged, brooding look which I am sure is attractive to some. He does a good frown and scowl. This means that, on the rare occasions that he smiles, it comes as something of a surprise. It's like the sun emerging from behind dark thunderclouds and then disappearing again. Well, that's the public persona. Maybe Carlsen smiles a lot more in private.
TBH, I'm more concerned with the handsomeness of his chess (or lack thereof). It is undoubtedly admirable, but not at all 'sexy' in my opinion.
First of all few questions:
-Carlsen has been selected one of the sexiest men on the world, but would that happen if he was lesser famous?
-Do women rate averagely-looking man handsome or sexy mostly because he is famous?
-Doesn't Carlsen look bit like a boxer? Is that handsome?
As heterosexual I am not of course the best person evaluate these things :) The handsomeness of Carlsen is far away from someone, say, Hugh Jackman's (even his past pics when he was same age).