As any of the leather chaps and jacket cruiser set knows, there’s a fine and uncomfortable line between motorcycle gear and what’s worn in the local fetish scene. Now, before those with sportier leanings get too uppity, one of our readers passed on an e-mail blast from Mr. S Leather in San Francisco. Yep, Puma’s Ducati Gear has made the jump from metrosexual to kink… And, from a marketing perspective that’s not a bad thing....