Conan Doyle's Holmes was not a romantic/sexy character in the least. Rather, Holmes had a detached, dismissive attitude towards feelings of romantic/sexual love that was spelled out (via Watson, of course) quite explicitly on the first page of A Scandal in Bohemia:

"All emotions, and that one particularly, were abhorrent to his cold, precise but admirably balanced mind. He was, I take it, the most perfect reasoning and observing machine that the world has seen, but as a lover he would have placed himself in a false position. He never spoke of the softer passions, save with a gibe and a sneer. They were admirable things for the observer—excellent for drawing the veil from men's motives and actions. But for the trained reasoner to admit such intrusions into his own delicate and finely adjusted temperment was to introduce a distracting factor which might throw doubt upon all his mental results. Grit in a sensitive instrument, or a crack in one of his own high-power lenses, would not be more disturbing than a strong emotion in a nature such as his."

This fanciful notion of Sherlock Holmes as a sexy, romantic adventurer is about as far from the original conception of the character as you can get. Quite acceptible, I'm sure, to those who merely want an excuse to go see Robert Downey Jr. be Robert Downey Jr. (again), and who have no particular interest in Doyle's character or the style and texture of his stories. But for fans of Sherlock Holmes, as originally written, this mischaracterization is probably more than a little distasteful.