If you look closely at the picture he's using for his signature, you'll notice that the lady on the back of the bike is "eating out her fingers" as though there's another hot female driving by she would like to have some "fun" with. Or - maybe I just have a dirty mind and she's tossing up some devil horns for the picture. How's that for something?
Nice bike by the way! Beautiful wife/girlfriend/friend on the back ;-)