I don't even know what it is or how to describe it, but it's like a certain twinkle in the eye. Someone who is playful but kind, funny, can take and make a joke. DH isn't classically handsome but he has a funny little cheeky crooked smile he does that makes him the most attractive man I've ever seen.
In celebrities and people I only get to see on screen etc it's got to be forearms and shoulders. In particular a just right T-Shirt with a cigarette packet rolled up in the sleeve. Or Billy Bones from Black Sails.