Why making a regular American sex-symbol out of Tom @twhiddleston would be a mistake? Look, he is not just a talented actor, is he? People love him also because he is a genius at sharing good ideas. Having his double first in Classics and being as charming as he is he is able not only to say the right things, but to make people believe them. On the cultural level Tom subtly represents some of the most important human virtues. Kindness. Compassion. Intellect. Courage. Patience. Passion for his profession. He taught people this things with his example many times, and encouraged them. He is a Renaissant man, with this penetrating fragile attractiveness subtly related to the classical beauty canons and the basic beauty concept - to something Plato, Dante, Shakespeare worked with. Yes, we call it sexiness now. But if you study sexiness, inspiration and motivation as carefully as I did, you will find out that there is much more complexity in them, and much more tints. Treating such complex attractiveness requires experience. Try using simple stereotyped patterns, and you will destroy it, even if Tom stays what he is.